WAEC SSCE - Biology - 1994 (Objective)

The process in which insects undergo conspicuous changes in form and appearance during development is known as metamorphosis. Metamorphosis is a biological process that occurs in some insects, including butterflies and beetles, where the insect undergoes a transformation in body structure and function. There are two types of metamorphosis: complete and incomplete. In complete metamorphosis, the insect undergoes a dramatic change in form, where it goes through four distinct stages: egg, larva, pupa, and adult. In incomplete metamorphosis, the insect goes through three stages: egg, nymph, and adult. These changes in form allow insects to adapt to different environments and ecological niches throughout their life cycle.

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Variety Of Organisms

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Question 3 Report

In their system of organisation, the diagram labelled II plays the role of a

worker

soldier

queen

drone

reproductive

Answer Details

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Classification

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Question 4 Report

Conventional method of sewage disposal involves all the following except defaecating

into pit latrines

in open fields

into cesspit

into bucket latrine

into water home sewage system

Answer Details

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Read lesson note on Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Humans And Environment

Excretory Systems And Mechanisms; Types Of Excretory Systems

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Question 5 Report

What is the theoretical probability that a normal male child will be born?

1\2

1\4

1\3

2\3

Answer Details

The theoretical probability that a normal male child will be born is 1/2 or 50%. This means that for every two children born, one is expected to be male and the other is expected to be female. This probability is based on the fact that human beings have 23 pairs of chromosomes, with one pair determining the sex of the child. Females have two X chromosomes, while males have one X and one Y chromosome. During fertilization, the sperm from the father can either carry an X or a Y chromosome, while the egg from the mother always carries an X chromosome. The chance of the sperm carrying an X or a Y chromosome is roughly equal, which means that there is an equal chance of conceiving a male or female child. Therefore, the theoretical probability of a normal male child being born is 1/2 or 50%.

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Behavioural Adaptations In Social Animals

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Question 6 Report

Which of the following is the least safe method of birth control? Using

spermicide creams

contraceptive pills

barriers such as condoms

intrauterine device

the withdrawal method

Answer Details

The least safe method of birth control among the given options is the withdrawal method. This method involves the male partner pulling out his penis before ejaculation, with the aim of preventing sperm from entering the vagina. However, this method is very unreliable because it's difficult to time and control ejaculation accurately, and even pre-ejaculate fluid can contain sperm. Therefore, it's possible for pregnancy to occur even if this method is used consistently and correctly. Additionally, the withdrawal method does not protect against sexually transmitted infections (STIs), so it's important to use another form of protection if STI prevention is also a concern.

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Question 7 Report

The two important physical processes involved in the absorption and transport of materials in plants are

diffusion and plasmolysis

cohesion and adhesion

flaccidity and turgidity

osmosis and diffusion

plasmolysis and capillarity

Answer Details

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Question 8 Report

The structure used by fishes to detect the presence and movement of other animals
by the vibration they produce is the

eye

nostril

lateral line

scales

fins

Answer Details

The structure used by fishes to detect the presence and movement of other animals by the vibration they produce is the lateral line. The lateral line is a sensory system present in most fish that runs along their sides from head to tail. It contains tiny sensory cells that can detect changes in water pressure and vibrations in the water. These vibrations could be produced by other fish, predators, prey or any other moving objects in the water. Fish use this sense to locate prey and navigate through their environment. The lateral line is crucial to the survival of many species of fish.

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Sense Organs (Nose, Tongue & Skin)

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Question 9 Report

which of the following is not a conservable natural resource?

Water

Sunlight

Forest

Soil

Minerals

Answer Details

Sunlight is not a conservable natural resource. This is because sunlight is a form of energy that is constantly being produced by the sun and cannot be depleted or conserved. While we can harness and use sunlight through solar energy technologies, the actual sunlight itself cannot be stored or saved for future use. On the other hand, water, forest, soil, and minerals are all natural resources that can be conserved through various management practices to ensure their sustainable use in the future.

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Read lesson note on Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Soil

Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals

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Question 10 Report

The part of the ear which equalizes air pressure on either side of the eardrum is
the

auditory meatus

malleus

Eustachian tube

oval window

stapes

Answer Details

The part of the ear which equalizes air pressure on either side of the eardrum is the Eustachian tube. The Eustachian tube connects the middle ear to the back of the throat, allowing air to flow in and out of the middle ear, which helps to equalize the pressure on either side of the eardrum. When there is a pressure difference, such as during changes in altitude, the Eustachian tube opens briefly to equalize the pressure and prevent discomfort or damage to the eardrum. In some cases, the Eustachian tube may become blocked, leading to ear pain or difficulty hearing, and this can be addressed through various treatments, such as nasal sprays or surgery.

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Sense Organs (Nose, Tongue & Skin)

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Question 11 Report

The structure labelled V is the

mitochondrion

ribosome

nucleus

centriole

nucleolus

Answer Details

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Read lesson note on Cell Structure (WAEC)

Protein Synthesis

Cell Structure

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Question 12 Report

The diagrams above represent a group of insects known to be

colonial

parasitic

soldier

carnivorous

symbiotic

Answer Details

Read lesson note on Symbiotic Interactions Of Plants And Animals (JAMB)

Read lesson note on The Ecology Of Populations (JAMB)

Symbiotic Interactions Of Plants And Animals

The Ecology Of Populations

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Question 13 Report

The ability of the eye to alter the focal length of the lens, with regard to the distance of the object from
the eye is known as

binocular vision

nocturnal vision

distortion

accommodation

focusing

Answer Details

The ability of the eye to alter the focal length of the lens, with regard to the distance of the object from the eye, is known as accommodation. This process enables us to focus on objects at different distances by changing the shape of the lens. When we look at objects that are far away, the ciliary muscles in the eye relax and the lens becomes flatter, allowing the light to be focused on the retina. Conversely, when we look at objects that are close, the ciliary muscles contract, causing the lens to become more curved and increase its refractive power, allowing us to see the object clearly. Accommodation is an important aspect of visual perception and is essential for everyday activities such as reading, driving, and using electronic devices.

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Question 14 Report

Which of the following actions is not an example of a simple reflex action?

Knee jerk

Blinking of the eye

Withdrawal of hand from hot object

Reading a book

Contraction of the iris

Answer Details

Reading a book is not an example of a simple reflex action. Simple reflex actions are automatic, involuntary and rapid responses of the body to a stimulus. They involve sensory neurons that detect the stimulus, and motor neurons that produce a quick response without involving the brain. Knee jerk, blinking of the eye, withdrawal of hand from hot object, and contraction of the iris are all examples of simple reflex actions. However, reading a book is a voluntary action that involves higher brain functions such as perception, comprehension, and memory. It is not a reflex action.

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Growth

Nervous Coordination

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Question 15 Report

The scientist who discovered the cell while examining a thin slice of cork under the microscope was

Robert Hooke

Anton van Leeuwenhoek

Matthias Schleiden

Theodor Schwann

Alexander Fleming

Answer Details

The scientist who discovered the cell while examining a thin slice of cork under the microscope was Robert Hooke. In 1665, he observed the structure of a cork under a microscope and noticed tiny empty compartments which he called "cells" because they reminded him of the small rooms in a monastery. This discovery is considered a fundamental one in the field of biology and led to the development of the cell theory.

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Cell Structure

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Question 16 Report

Which of the following factors does not control population growth?

Food shortage

Emigration

Abundance of food

Predation

Natural disaster

Answer Details

The factor that does not control population growth is "Abundance of food." This is because an abundance of food can lead to increased reproduction and survival rates, which can in turn increase population growth. The other factors listed can all have an impact on population growth: food shortage can decrease reproduction and survival rates, emigration can decrease the size of the population, predation can decrease survival rates, and natural disasters can cause death and decrease survival rates.

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Co-ordination And Control

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Question 17 Report

Which of the following relationships illustrates competition?

Cattle egret moving along with cattle

Goats and cows grazing on a small grass lawn

Mosses succeeding lichens in a rocky terrain

Red mangrove swamp dying and replaced by white mangrove

Forest trees, shrubs and grasses replacing white mangrove in a swamp

Answer Details

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Evolution Among The Monera, Protista, Fungi, Plantar and Animalia

Relevance Of Biology To Agriculture

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Question 18 Report

The morphological, physiological and behavioural characteristics which enable an organism to survive in
its environment is called

heredity

ecology

competition

adaptation

variation

Answer Details

The characteristics that enable an organism to survive in its environment are called adaptations. These adaptations can be morphological (related to the organism's physical structure), physiological (related to the organism's internal systems and processes), or behavioural (related to the organism's actions and interactions with its environment). Adaptations are the result of natural selection, which is the process by which organisms that are better suited to their environment are more likely to survive and reproduce. Over time, these advantageous traits become more common in a population, leading to the evolution of new species. Adapting to environmental changes is a key factor in an organism's ability to survive and thrive in its ecosystem.

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Symbiotic Interactions Of Plants And Animals

Behavioural Adaptations In Social Animals

Heredity

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Question 19 Report

Which of the following structures does not function as support in animals?

Cuticle in arthropods

Scales in' birds

Cartilage in mammals

Body fluid in earthworms

Bones in vertebrates

Answer Details

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Tissues And Supporting Systems:

Regulation Of Internal Environment

Cell Structure

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Question 20 Report

What is the fate of the ovary of a flower after fertilization?

becomes the seed

withers away

becomes the fruit

develops more nuclei

develops into sepals.

Answer Details

After fertilization, the ovary of a flower typically develops into the fruit. The fertilized ovules within the ovary will develop into seeds, which are contained within the fruit. The ovary walls thicken and enlarge as the seeds develop, and the fruit can take on a variety of shapes and sizes depending on the specific plant species. The fruit serves to protect and nourish the seeds, aiding in their dispersal and ensuring the survival and growth of the next generation of plants.

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Question 21 Report

The process whereby poisonous compounds are made harmless in the liver is called

deamination

glycolysis

dehydration

detoxification

denitritication

Answer Details

The correct answer is detoxification. Detoxification is the process by which harmful and poisonous substances are changed into harmless substances by the liver. These harmful substances can be toxins, drugs, alcohol, or waste products of metabolism. The liver breaks down these substances into harmless compounds that can be easily excreted from the body. This process is crucial to maintaining the body's health and well-being.

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Excretory Systems And Mechanisms; Types Of Excretory Systems

Heredity

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Question 22 Report

Which of the following structural features in animals does not affect control of body temperature?

Scales

Skin

fur

Capillaries

Feathers

Answer Details

The structural features that help in controlling body temperature in animals include scales, skin, fur, capillaries, and feathers. Out of these, capillaries are not considered a structural feature that helps in controlling body temperature, as they are part of the circulatory system that facilitates the exchange of nutrients and gases between the blood and body tissues. Although capillaries play a crucial role in regulating body temperature by controlling blood flow to the skin's surface, they are not considered a structural feature as they are too small to be seen with the naked eye. Therefore, the correct answer is "Capillaries."

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Nutrient Cycling In Nature

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Question 23 Report

Which of these is not part of the appendicular skeleton?

Clavicle

Vertebral column

Scapula

Femur

Humerus

Answer Details

The appendicular skeleton is composed of the bones that form the limbs and the girdles that connect the limbs to the axial skeleton. The axial skeleton includes the bones of the skull, vertebral column, and ribcage. Out of the options provided, the vertebral column is not part of the appendicular skeleton. The vertebral column is a part of the axial skeleton, and it forms the main axis of the body, providing support and protection for the spinal cord. The other options provided, including the clavicle, scapula, humerus, and femur, are all part of the appendicular skeleton. The clavicle and scapula form the pectoral girdle, while the humerus, radius, and ulna form the arm bones. The femur, tibia, fibula, and patella form the leg bones, and the pelvic girdle connects the legs to the axial skeleton.

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Read lesson note on Tissues And Supporting Systems: (WAEC)

Transport System

Classification

Tissues And Supporting Systems:

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Question 24 Report

The long and sharp claws in the font labelled ll show that the bird uses them to

hold onto its prey

paddle in water

glide in the alt

scratch the earth for worms

burrow into the soil

Answer Details

The long and sharp claws in the front labeled ll on a bird indicate that it uses them to hold onto its prey. Birds of prey, such as eagles and hawks, have sharp talons for catching and holding onto their prey, usually small mammals or other birds. The talons are also used to help the bird climb and perch on branches or other surfaces. The shape and size of the talons vary depending on the species of bird and its feeding habits.

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Question 25 Report

Which of the following measures does not ensure conservation?

Establishing forest and game reserves

Encouraging people to plant trees

Founding societies that promote conservation

Enacting conservation laws and bye-laws

Enclosing fishes in ponds where they will not be stolen

Answer Details

The measure that does not ensure conservation is "enclosing fishes in ponds where they will not be stolen." While this action may protect a certain population of fish from being stolen, it does not contribute to the overall conservation of the species. Conservation involves preserving and protecting natural resources and ecosystems to maintain biodiversity and sustainability. Therefore, measures such as establishing reserves, promoting reforestation, and enacting laws that protect species and their habitats are more effective in achieving conservation goals.

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Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals

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Question 26 Report

Which of the following structural features adapts Drosera (Sundew) to its carnivorous mode of nutrition?

Long root with glandular hairs

Club-shaped glandular hairs on leaves

Prominent lenticel on the stem

Broad leaves with long spines

Wide stomata under the leaves

Answer Details

The structural feature that adapts Drosera (Sundew) to its carnivorous mode of nutrition is the club-shaped glandular hairs on its leaves. These glandular hairs have a sticky secretion that traps insects and other small organisms, providing the plant with the necessary nutrients it cannot get from the soil. The broad leaves with long spines and wide stomata under the leaves are not directly involved in the carnivorous mode of nutrition, while the long root with glandular hairs and prominent lenticel on the stem serve other purposes, such as anchoring the plant and allowing gas exchange, respectively.

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Question 27 Report

The deficiency of calcium in a plant may result in

stunted growth and poor root development

poor growth, leaves become orange or brown

stunted growth, slender stem and yellowing of leaves

very small leaves and yellowing of leaves

tall weedy and reddish leaves, `

Answer Details

The deficiency of calcium in a plant may result in stunted growth and poor root development. Calcium is an important nutrient for plant growth and development, and it plays a critical role in maintaining the structure and function of cell walls. Without sufficient calcium, plants may not be able to develop strong and healthy roots, which can lead to stunted growth and poor overall plant health. Additionally, calcium deficiency can also cause other symptoms such as leaf curling, necrosis, and tip burn.

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Variation In Population

Plant Nutrition

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Question 28 Report

The foot labelled III is strong and has blunt claws
on its digits, This implies that the bird

is a scavenger

is a bird of prey

is a marine bird

uses the foot to scratch the soil

uses the foot to supplement wing action in flight

Answer Details

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Biotechnology

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Question 29 Report

The control of water and salt requirements of the body in order to maintain a stable internal environment
is known as

osmosis

excretion

plasmolysis

ultrafiltration

homeostasis

Answer Details

Homeostasis is the control of the water and salt requirements of the body in order to maintain a stable internal environment. It is the regulation and maintenance of a relatively constant internal environment within the body despite changes in external environmental conditions. Homeostasis is achieved through various mechanisms in the body such as regulation of body temperature, regulation of pH, and regulation of water and salt balance. The body's ability to maintain homeostasis is critical for survival, as many cellular and physiological processes depend on the maintenance of a stable internal environment.

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Read lesson note on Properties And Functions Of The Living Cell (WAEC)

Excretory System

Probability In Genetics (Hybrid Formation)

Properties And Functions Of The Living Cell

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Question 30 Report

Which of the following is not required for primary production to occur in plants?

Chlorophyl

Sugar

Water

Carbon dioxide

Solar energy

Answer Details

Sugar is not required for primary production to occur in plants. Primary production in plants refers to the process of converting light energy into chemical energy by the process of photosynthesis. During photosynthesis, plants use the energy from sunlight to convert carbon dioxide and water into glucose (a type of sugar) and oxygen. This process requires the presence of chlorophyll, a green pigment found in the chloroplasts of plant cells, which absorbs light energy from the sun. Water and carbon dioxide are also necessary for primary production to occur. Water is required to provide hydrogen ions for the synthesis of glucose, while carbon dioxide is a source of carbon that is used to build the glucose molecule. Solar energy is the ultimate source of energy for primary production in plants. Without sunlight, plants would not be able to carry out photosynthesis and produce the energy they need to survive. However, sugar is not a requirement for primary production to occur in plants. Glucose is produced as a result of photosynthesis, but it is not necessary for the process to occur. Rather, glucose is a byproduct of the process and is used by the plant as a source of energy for growth and other metabolic processes. Therefore, sugar is the option that is not required for primary production to occur in plants.

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Plant Nutrition

Ecosystem

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Question 31 Report

The following conditions form the basis of competition in a habitat except

food

space

reproductive mate

light

body structure

Answer Details

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Local (Nigerian) Biomes

Co-ordination And Control

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Question 32 Report

In man, adult schistosoma is found in the

blood vessels of the bladder

red blood corpuscles

lymphatic vessel

blood vessels of the lung

white blood cells

Answer Details

Adult Schistosoma is found in the blood vessels of the bladder of humans. Schistosoma is a parasitic flatworm that causes a disease called schistosomiasis, which is transmitted by contact with contaminated water. When the larvae of the Schistosoma parasite penetrate the skin of a human host, they migrate to the veins in the abdominal area and then to the blood vessels of the bladder, where they develop into adult worms. These adult worms lay their eggs, which are passed out of the body in the urine, leading to a host of symptoms associated with schistosomiasis.

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Question 33 Report

Which of the following represents the correct order in a possible food chain?

Crustacean -> diatom -> fish -> man

Fish -> crustacean -> man -> diatom

Man -> fish -> crustacean -> diatom

Diatom -> crustacean -> fish -> man

Man -> diatom -> fish -> crustacean

Answer Details

A food chain is a linear sequence of organisms that shows how energy is transferred from one organism to another as they consume each other. The correct order in a possible food chain is Diatom -> Crustacean -> Fish -> Man. Diatoms are microscopic algae that form the base of the food chain. Crustaceans such as zooplankton feed on diatoms, then fish feed on crustaceans, and finally, man feeds on fish. Therefore, the energy and nutrients flow from the primary producer, diatoms, to the top consumer, man, through the intermediate consumers, crustaceans and fish.

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Nitrogen Cycle

Food Webs And Trophic Levels

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Question 34 Report

Mutation leads to evolution in that it

gives rise to offspring which have the same characteristics as the parents

kill all organism where it has occurred

gives rise to new individuals which differs considerably from their parents

always confers adaptability of the offspring

does nit confer adaptability to the offspring

Answer Details

Mutation leads to evolution in that it gives rise to new individuals which differ considerably from their parents. Mutations are changes in the genetic material of an organism that occur randomly and can lead to new traits. If these new traits are advantageous in a particular environment, they can increase an organism's chances of survival and reproduction, leading to the evolution of a new species over time. Mutations do not always confer adaptability to the offspring, but they increase genetic diversity, which can provide the raw material for natural selection to act upon.

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Living Organisms

Evolution (Theories and Evidence)

Adaptive Colouration

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Question 35 Report

Which pair of structures contributes to balance in mammals?

Utriculus and Sacculus

Malleus and Stapes

Sacculus and cochlea

Utriculus and pinna

Fenestra ovalis and sacculus

Answer Details

The pair of structures that contribute to balance in mammals are the utriculus and sacculus. The utriculus and sacculus are two structures located in the inner ear, specifically in the vestibular system. These structures are responsible for detecting linear acceleration and head position, which is important for maintaining balance. The utriculus and sacculus contain specialized hair cells that are embedded in a gel-like substance. When the head moves, the gel-like substance moves as well, which bends the hair cells and creates an electrical signal. This electrical signal is then sent to the brain, which uses the information to help maintain balance. The other options listed (malleus and stapes, sacculus and cochlea, utriculus and pinna, and fenestra ovalis and sacculus) are all structures in the ear, but they do not play a direct role in balance. The malleus and stapes are part of the middle ear and are involved in hearing. The cochlea is also involved in hearing, while the pinna is the external part of the ear. The fenestra ovalis is a small opening in the inner ear that connects to the middle ear and is involved in transmitting sound waves.

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Question 36 Report

The process by which plants manufacture food from carbondioxide and water, using energy from the sun is
termed

chemosynthesis

photosynthesis

autotrophism

heterotrophism

transpiration

Answer Details

The correct answer is photosynthesis. Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of organic compounds, mainly carbohydrates. This process occurs in the chloroplasts of plant cells and involves the use of pigments such as chlorophyll to absorb light energy, which is then used to power the conversion of carbon dioxide and water into glucose and oxygen. In photosynthesis, carbon dioxide is taken in through small openings in the leaves called stomata, while water is absorbed through the roots and transported to the leaves via the xylem. During the process, light energy is captured by chlorophyll and other pigments, and used to power the conversion of carbon dioxide and water into glucose and oxygen. The oxygen produced is then released into the atmosphere as a byproduct, while the glucose is used as an energy source for the plant.

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Nutrition

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Question 37 Report

Which of these statements is correct in the human ABO blood grouping system?

B is recessive

A is dominant over B

O is recessive

O has antigene A and B

A and B are both recessive

Answer Details

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Support And Movement

Growth

Reproduction

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Question 38 Report

The gradual, cumulative, adaptive and heritable changes in an organism over a long period of time resulting
in emergence of new species is known as

adaption

survival

regeneration

variation

organic evolution

Answer Details

The gradual, cumulative, adaptive and heritable changes in an organism over a long period of time resulting in emergence of new species is known as organic evolution. Organic evolution is the process by which species of organisms change over time through the gradual accumulation of beneficial adaptations. This process occurs through the mechanisms of natural selection, genetic drift, and gene flow, which act to alter the frequency and distribution of genetic traits within a population. Through organic evolution, new species can arise from common ancestors through the process of speciation, where isolated populations of organisms diverge genetically and eventually become distinct species. This process can occur through geographic isolation, ecological specialization, or reproductive isolation. The concept of organic evolution was first proposed by Charles Darwin in the mid-19th century, and has since become a fundamental principle in the field of biology. The study of evolution provides insights into the diversity of life on Earth and the complex relationships between different organisms and their environments. In summary, the gradual, cumulative, adaptive and heritable changes in an organism over a long period of time resulting in emergence of new species is known as organic evolution, which is a fundamental principle in the field of biology.

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Theories Of Evolution

Evolution (Theories and Evidence)

Evidence Of Evolution

Heredity

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Question 39 Report

In which of the following is a cellulose cell wall present

Amoeba

Mammalian white blood corpuscle

spirogyra

paramecium

parasitic worms

Answer Details

A cellulose cell wall is present in Spirogyra. Spirogyra is a filamentous green algae which possesses a cell wall made up of cellulose. Cellulose is a complex carbohydrate that provides structural support to the cells of plants and many algae. Amoeba and paramecium are unicellular organisms that do not possess a cellulose cell wall. Mammalian white blood corpuscles are cells of the immune system which also do not possess a cellulose cell wall. Parasitic worms also do not have cellulose cell walls.

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Amoeba, Paramecium, And Euglena

Cell Structure

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Question 40 Report

Which of the following agents is responsible for the dispersal of the seed shown above?

man

Water

Wind

Explosive mechanism

Animal

Answer Details

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Protein Synthesis

Growth

Ecosystem

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Question 41 Report

The branch of science which deals with resemblances, origin and expression of biological variations is
called

embryology

ecology

entomology

genetics

taxonomy

Answer Details

The branch of science that deals with resemblances, origin, and expression of biological variations is called genetics. Genetics is the study of genes, heredity, and genetic variation in living organisms. It encompasses many different fields, including molecular biology, biochemistry, and genomics, and is concerned with understanding how genetic information is passed from parents to offspring, how it is expressed in different organisms, and how it gives rise to variations in traits. Geneticists study the structure and function of genes, the mechanisms of inheritance, and how genetic variations can lead to diseases or affect the characteristics of an organism. They also investigate how genetic information can be used to improve agriculture, medicine, and biotechnology.

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Heredity

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Question 42 Report

Spermatogenesis and Oogenesis are both terms used to describe

mitosis

meiosis

mating

implantation

gametogenesis

Answer Details

Spermatogenesis and Oogenesis are terms used to describe the process of gametogenesis. Gametogenesis is the process of producing gametes, which are the reproductive cells in sexually reproducing organisms. In males, the process of spermatogenesis produces sperm cells, while in females, the process of oogenesis produces egg cells. Both spermatogenesis and oogenesis involve meiosis, a type of cell division that produces haploid cells (cells with half the number of chromosomes as the parent cell) from diploid cells (cells with the full number of chromosomes).

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Heredity

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Question 43 Report

All the following can illustrate the dynamic nature of the ecosystem except

nitrogen cycle

carbon cycle

water cycle

nutrient cycle

locomotion in organisms

Answer Details

The correct answer is "locomotion in organisms". The other options listed, such as the nitrogen cycle, carbon cycle, water cycle, and nutrient cycle, are all processes that demonstrate how materials and energy flow through an ecosystem, and how different organisms interact with each other and their environment. These cycles are constantly in motion and are essential for maintaining the balance and stability of an ecosystem. In contrast, locomotion in organisms refers to the movement of an organism from one place to another, which can certainly impact the ecosystem in various ways, but does not necessarily illustrate the dynamic nature of the ecosystem as a whole.

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Nitrogen Cycle

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Question 44 Report

Which of the following is not a pollution control measure?

Penalising those who dump refuse on water or land

Controlling the emission of smoke from automobiles and industries

Ensuring that there is no spillage of oil.

Establishing government agencies like Federal Environmental Protection Agency (FEPA)

Channelling sewage into streams

Answer Details

The option that is not a pollution control measure is "Channelling sewage into streams". This is because sewage contains various pollutants such as pathogens, organic matter, and nutrients that can harm aquatic life and human health. Therefore, channelling sewage into streams will worsen the pollution and harm the ecosystem. Pollution control measures aim to reduce or prevent the release of pollutants into the environment to minimize their harmful effects. Penalizing those who dump refuse on water or land, controlling emissions of smoke from automobiles and industries, ensuring no spillage of oil, and establishing government agencies like Federal Environmental Protection Agency (FEPA) are all pollution control measures.

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Question 45 Report

Which of the following is not a condition necessary for germination to occur in most seeds?

Water

Air

Activation of enzymes

Temperature

Soil fertility

Answer Details

Soil fertility is not a condition necessary for germination to occur in most seeds. Germination is the process by which a seed develops into a new plant. For germination to occur, most seeds require water to activate enzymes, air for respiration, and a suitable temperature to trigger metabolic processes. Soil fertility, although important for the growth of the new plant, is not a direct requirement for germination. Soil provides the nutrients necessary for the plant to grow after germination, but the seed can still germinate and begin to develop into a new plant without being in soil. Therefore, the correct option is "Soil fertility".

Read lesson note on Organization Of Life (WAEC)

Read lesson note on Classification (WAEC)

Organization Of Life

Classification

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Question 46 Report

Which of the following terms is not associated with finger prints?

Arch

Loop

Suture

Whorl

Compound

Answer Details

Read lesson note on Nucleic Acids (WAEC)

Read lesson note on Reproduction (Physical Changes In Males And Females) (WAEC)

Nucleic Acids

Reproduction (Physical Changes In Males And Females)

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Question 47 Report

Which of the following is not a continuous variation?

Height of plants

Skin colour

Ability to roll tongue

Length of fingers

Leaf size.

Answer Details

Continuous variation refers to the variation in which a trait can take any value within a range, with no distinct categories. Therefore, the characteristic that is not an example of continuous variation is the "ability to roll tongue," since this is a discrete trait that can be either present or absent, with no intermediate values. In contrast, height, skin color, finger length, and leaf size are all traits that can vary continuously within a population.

Read lesson note on Physiological Variations (WAEC)

Read lesson note on Heredity (JAMB)

Physiological Variations

Heredity

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Question 48 Report

What is the foot labelled I adapted to?

Feeding on flesh

Eating grains

Swimming in water

Perching on trees

Catching insects in flight

Answer Details

Read lesson note on Biological Fuel Generation (WAEC)

Biological Fuel Generation

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Question 49 Report

All animals are dependent on green plants because plants

shelter them from excessive heat from the sun

give them protection from enemies

are used for building houses and furniture

beautify their surroundings

manufacture food for animals

Answer Details

All animals are dependent on green plants because plants manufacture food for animals. Plants are able to manufacture their own food through the process of photosynthesis, using energy from the sun, water, and carbon dioxide. This food is stored in the form of carbohydrates, which is then used by animals for their survival. Animals, in turn, are dependent on plants as a source of food, either directly by consuming them or indirectly by feeding on other animals that have eaten plants. Therefore, plants are the primary producers and form the basis of the food chain, making them essential for the survival of all animals.

Read lesson note on Ecological Components (WAEC)

Read lesson note on Ecosystem (WAEC)

Ecological Components

Ecosystem

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Question 50 Report

Muscles are attached to bones by means of

ligament

cartilage

capillaries

tendons

arteries

Answer Details

Muscles are attached to bones by means of tendons. Tendons are tough, fibrous connective tissues that connect muscles to bones, allowing for the transmission of the force generated by the contraction of the muscle to the bone, resulting in movement of the body part. They are composed mainly of collagen fibers and can withstand tension and stress, which is necessary for the movement and stability of the skeletal system.

Read lesson note on Tissues And Supporting Systems: (WAEC)

Tissues And Supporting Systems:

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Question 51 Report

Which of the following organisms exists as a filament?

Euglena

Amoeba

Volvox

paramecium

Spirogyra

Answer Details

Out of the options given, Spirogyra exists as a filament. A filament is a long chain of cells that are attached to each other end-to-end forming a thread-like structure. Spirogyra is a type of green algae that is commonly found in freshwater habitats. Its cells are arranged in long chains, forming filaments that can be seen with the naked eye. The other organisms listed are not filamentous, but exist as single cells or colonies.

Read lesson note on Amoeba, Paramecium, And Euglena (WAEC)

Amoeba, Paramecium, And Euglena

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Question 52 Report

Which of the following is the carrier of hereditary materials?

Centriole

Cytoplasm

Nucleolus

Chromosome

Lysosome

Answer Details

The carrier of hereditary materials is a chromosome. Chromosomes are long, coiled-up molecules of DNA that carry the genes which contain the hereditary information that gets passed down from one generation to the next. They are found in the nucleus of eukaryotic cells and are visible under a microscope during cell division. The DNA in chromosomes is responsible for the traits that an organism inherits from its parents. Therefore, the correct option is "Chromosome".

Read lesson note on Chromosomes: The Basis Of Heredity (WAEC)

Read lesson note on Nucleic Acids (WAEC)

Chromosomes: The Basis Of Heredity

Nucleic Acids

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Question 53 Report

Which of the following does not imply attempt at conservation?

Limit on the size of nets used in fishing

Limit on the size of vessels to be used in fishing

Prohibition of hunting or fishing at a certain season

Prudent management of natural resources

Retraining from the use of the natural resource

Answer Details

The option that does not imply an attempt at conservation is "Retraining from the use of the natural resource." This is because it suggests a complete cessation or abandonment of the use of a natural resource, rather than managing it in a sustainable way to conserve it for future generations. Conservation involves using natural resources in a way that maintains their availability and productivity over time, without causing harm to the environment or depleting them beyond their ability to replenish. Therefore, all the other options listed in the question imply an attempt at conservation by putting limits on the size of nets and vessels used in fishing, prohibiting hunting or fishing at certain seasons, and managing natural resources prudently to maintain their sustainability.

Read lesson note on Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals

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Question 54 Report

In which of the following organisms is the siphon found?

Tadpole

Pupa of mosquito

Tilapia

Crayfish

Butterfly

Answer Details

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Question 55 Report

Which of the following can cause desert encroachment?

Afforestation

Irrigation

Planting of trees

Establishment of game reserve

Overgrazing

Answer Details

Desert encroachment can be caused by overgrazing. Overgrazing refers to the excessive grazing of livestock on a particular land area. When there are too many animals grazing in a particular area, they eat more plants than the ecosystem can replace, which leads to a reduction in vegetation cover. Without vegetation, the soil is exposed to harsh weather conditions like wind and sun, which makes it more susceptible to erosion. When soil erosion occurs, it can lead to the formation of desert-like conditions where once fertile land existed. On the other hand, afforestation, planting of trees, irrigation, and the establishment of game reserves can actually help to prevent desert encroachment by increasing vegetation cover and preventing soil erosion. Therefore, these practices are often used as strategies to combat desertification.

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Question 56 Report

Which of the following plant diseases is indicated when grains of cereals are covered with a mass of
spores?

Smut

Mosaic

Maize streak

Fungal blast

Rust

Answer Details

The plant disease that is indicated when grains of cereals are covered with a mass of spores is called smut. Smut is a fungal disease that affects cereal crops like corn, wheat, and barley. It causes the formation of black or dark brown masses of spores on the grains, which can reduce crop yield and quality. These spores can easily spread to other plants, infecting them as well. Farmers can prevent smut by using resistant crop varieties, crop rotation, and fungicides.

Read lesson note on Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals

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Question 57 Report

Which of the following performs the same function as the contractile vacuole of a unicellular organism?

Kidney

Alimentary canal

Liver

Pancreas

Bladder

Answer Details

The kidney performs the same function as the contractile vacuole of a unicellular organism. Both the contractile vacuole and kidney are responsible for regulating the water content of the cell and the body, respectively. The contractile vacuole in unicellular organisms eliminates excess water from the cell, while the kidney in multicellular organisms eliminates excess water and other waste products from the body. This process helps to maintain the osmotic balance of the organism's internal environment.

Read lesson note on Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Read lesson note on The Cell And Its Environment: Physical And Biophysical Processes (WAEC)

Excretory Systems And Mechanisms; Types Of Excretory Systems

The Cell And Its Environment: Physical And Biophysical Processes

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Question 58 Report

Which of the following determines a normal male offspring?

Answer Details

The sex of a human offspring is determined by the presence or absence of a Y chromosome. A normal male offspring has one X chromosome and one Y chromosome, which is represented as XY. Females have two X chromosomes, which is represented as XX. YY is not a possible combination for humans, and X and Y on their own do not determine a normal male offspring.

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Question 59 Report

In human beings the albino trait it recessive and the normal skin colour is dominant. Therefore the probability
of parent’s that are heterozygous for albinism, having an albino child

1\4

1\2

1\3

2\3

Answer Details

In humans, the albino trait is recessive, which means that an individual must inherit two copies of the albino gene (one from each parent) to have albinism. Normal skin color is dominant, meaning that an individual only needs one copy of the normal skin color gene to express that trait. If both parents are heterozygous for albinism, meaning they carry one albino gene and one normal skin color gene, then each parent has a 50% chance of passing on the albino gene and a 50% chance of passing on the normal skin color gene to their child. Therefore, the probability of both parents passing on the albino gene to their child is (1/2) x (1/2) = 1/4 or 25%. This means that the probability of the heterozygous parents having an albino child is 1/4 or 25%.

Read lesson note on Genetic Terminologies (WAEC)

Genetic Terminologies

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Question 60 Report

Which of the following blood group(s) is/are the universal donor(s)

AB and O

Answer Details

The correct answer is O. Blood types are classified based on the presence or absence of certain antigens on the surface of red blood cells. The two most important blood group systems are ABO and Rh. Blood group O does not have A or B antigens on the surface of its red blood cells. This means that blood group O can be safely transfused into individuals with any blood group (A, B, AB, or O) without causing an adverse immune reaction. Therefore, blood group O is often referred to as the universal donor. In contrast, individuals with blood group AB have both A and B antigens on the surface of their red blood cells, making them universal recipients. This is because they can safely receive blood from any blood group without the risk of an adverse immune reaction. Blood groups A and B are not considered universal donors because they contain antigens that can trigger an immune response in individuals with different blood groups.

Read lesson note on Support And Movement (JAMB)

Support And Movement

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