WAEC SSCE - Biology - 2017 (Objective)

Ibeere 1 Ìròyìn

Which of the following characters is not a morphological variation?

shape of the nose

colour of skin

colour of hair

tongue rolling Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Morphological Variations In The Physical Appearance Of Individuals (WAEC)

Morphological Variations In The Physical Appearance Of Individuals

Wo Idahun

Ibeere 2 Ìròyìn

The diagram above illustrates a part of the human skeleton. It represents the bones of the

upper arm

lower arm Ìdáhùn tó tọ́

upper leg

lower leg

Awọn alaye Idahun

Wo Idahun

Ibeere 3 Ìròyìn

An example of osmosis in plants is the

movement of water through the xylem

loss of water vapour from the stomata

translocation of food through the phloem

absorption of water from the soil by the root Ìdáhùn tó tọ́

Awọn alaye Idahun

An example of osmosis in plants is the absorption of water from the soil by the root. Osmosis is the movement of water molecules from an area of high water concentration to an area of low water concentration through a selectively permeable membrane. In plants, the root hairs, which are thin extensions of the root, have a higher concentration of solutes (dissolved substances) than the surrounding soil. As a result, water moves from the area of high water concentration in the soil to the area of low water concentration in the root hairs via osmosis. This is an essential process for the plant to absorb the water and nutrients it needs for growth and survival.

Ka ìwé ẹ̀kọ́ nípa Nucleic Acids (WAEC)

Ka ìwé ẹ̀kọ́ nípa Cell Structure (WAEC)

Nucleic Acids

Cell Structure

Wo Idahun

Ibeere 4 Ìròyìn

Which of the following materials is not easily biodegradable?

Polythene bag Ìdáhùn tó tọ́

Cotton bag

Hides and Skin bag

Paper bag

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Evolution (Recombination DNA) (WAEC)

Evolution (Recombination DNA)

Wo Idahun

Ibeere 5 Ìròyìn

Which of the following statements is true about mutation?

Phenotype is not involved

Genotype is not involved

Artificial induction is not possible

Genotype is involved Ìdáhùn tó tọ́

Awọn alaye Idahun

Genotype is involved in mutation. A mutation is a change in the DNA sequence of a gene. The DNA sequence of a gene determines the gene's function, and this function is known as the gene's genotype. So, when a mutation occurs in a gene, it changes the gene's genotype and can result in a different phenotype, which is the observable physical or functional characteristic of an organism that is determined by its genotype. Therefore, it is incorrect to say that the genotype is not involved in mutation.

Ka ìwé ẹ̀kọ́ nípa Heredity (JAMB)

Heredity

Wo Idahun

Ibeere 6 Ìròyìn

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

adaptation

survival

organic evolution Ìdáhùn tó tọ́

interspecific competition

Awọn alaye Idahun

The gradual cumulative, adaptive and heritable changes in an organism over a long period of time resulting in new species is called organic evolution. Organic evolution is the process by which species of living organisms change over time through a combination of genetic variation and natural selection. Over many generations, small changes in the traits of an organism accumulate, leading to new, distinct species that are better adapted to their environment. This process can take hundreds or thousands of years and is driven by the survival and reproduction of organisms that have traits that give them an advantage in their environment.

Ka ìwé ẹ̀kọ́ nípa Theories Of Evolution (JAMB)

Ka ìwé ẹ̀kọ́ nípa Evolution (Theories and Evidence) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Evidence Of Evolution (JAMB)

Ka ìwé ẹ̀kọ́ nípa Evolution (Recombination DNA) (WAEC)

Theories Of Evolution

Evolution (Theories and Evidence)

Evidence Of Evolution

Evolution (Recombination DNA)

Wo Idahun

Ibeere 7 Ìròyìn

The number of individuals that the environment can support over a long period of time is its

growth rate

total capacity

population capacity Ìdáhùn tó tọ́

carrying capacity

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Co-ordination And Control (JAMB)

Co-ordination And Control

Wo Idahun

Ibeere 8 Ìròyìn

Which of the following resources cannot be renewed?

Air

Petroleum Ìdáhùn tó tọ́

Food crop

Soil

Awọn alaye Idahun

Petroleum is a resource that cannot be renewed. Petroleum, also known as crude oil, is a fossil fuel that was formed millions of years ago from the remains of plants and animals. It is a non-renewable resource because it takes millions of years to form and cannot be replenished at the same rate it is being used. Once all the petroleum reserves have been extracted, there will be no more left. This is in contrast to renewable resources such as air, food crops, and soil, which can be replenished naturally over time.

Ka ìwé ẹ̀kọ́ nípa Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

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

Wo Idahun

Ibeere 9 Ìròyìn

Assuming that A is the gene for normal skin color and is dominant, while a is the gene for albinism and its recessive, what is the likely genotype of the couple which had 50% normal and 50% albino offspring?

AA, aa

Aa, aa Ìdáhùn tó tọ́

AA, Aa

Aa, Aa

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Genetic Terminologies (WAEC)

Genetic Terminologies

Wo Idahun

Ibeere 10 Ìròyìn

When viewing an object that is close to the human eye, the

eye lens becomes thin

ciliary muscles relax

suspensory lens become taut

eye lens becomes fat Ìdáhùn tó tọ́

Awọn alaye Idahun

When viewing an object that is close to the human eye, the eye lens becomes fat. The process of changing the shape of the eye lens to focus on objects at different distances is called accommodation. When the eye is focusing on a nearby object, the ciliary muscles in the eye contract, which causes the suspensory ligaments to relax. This, in turn, allows the eye lens to become more rounded and thicker, which increases its refractive power. The increased curvature of the eye lens allows the eye to bend the light more, so that the light rays converge and focus on the retina, producing a clear and sharp image. This process of accommodation is necessary to see objects clearly at different distances, and it is an automatic process controlled by the brain. Therefore, when viewing an object that is close to the human eye, the eye lens becomes fat to focus the light rays and produce a clear image on the retina.

Ka ìwé ẹ̀kọ́ nípa Animal Nutrition (WAEC)

Ka ìwé ẹ̀kọ́ nípa Sense Organs (Nose, Tongue & Skin) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Cell Structure (WAEC)

Animal Nutrition

Sense Organs (Nose, Tongue & Skin)

Cell Structure

Wo Idahun

Ibeere 11 Ìròyìn

The diagram above is an illustration of the urinary tubule in a mammal. Which of the following substances is greater in concentration in the part labelled IV when compared to that part labelled I?

Lipid

Glucose

Urea Ìdáhùn tó tọ́

Uric acid

Awọn alaye Idahun

The substance that is greater in concentration in the part labeled IV when compared to that part labeled I is Urea. The urinary tubule is a part of the renal system and is responsible for filtering waste products from the blood and reabsorbing important substances back into the bloodstream. In the diagram, the part labeled I represents the beginning of the urinary tubule, where the blood is filtered to remove waste products. The part labeled IV represents the end of the tubule, where the final concentration of waste products is determined. Urea is a waste product produced by the liver and is present in high concentrations in the blood. As the blood passes through the urinary tubule, some of the urea is reabsorbed back into the bloodstream, but most of it continues to be filtered and concentrated in the part labeled IV. The concentration of urea in the part labeled IV is therefore greater than that in the part labeled I. Lipids, glucose, and uric acid are not primarily waste products of the renal system, but they can be filtered and reabsorbed in small amounts along with urea and other waste products.

Ka ìwé ẹ̀kọ́ nípa Animal Nutrition (WAEC)

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Animal Nutrition

Excretory Systems And Mechanisms; Types Of Excretory Systems

Wo Idahun

Ibeere 12 Ìròyìn

The diagram above is an illustration of the urinary tubule in a mammal. Which of the following substances is found in the part labelled II only?

Lipid

Glucose

Urea Ìdáhùn tó tọ́

Uric acid

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Ka ìwé ẹ̀kọ́ nípa Excretion (JAMB)

Excretory Systems And Mechanisms; Types Of Excretory Systems

Excretion

Wo Idahun

Ibeere 13 Ìròyìn

Deamination of amino acids in the liver produces

blood sugar

glycogen

bile

urea Ìdáhùn tó tọ́

Awọn alaye Idahun

Deamination of amino acids in the liver produces urea. When proteins are broken down in the body, the amino acids are transported to the liver for processing. In the liver, enzymes remove the amino group from the amino acids, a process called deamination. This produces ammonia, which is toxic to the body. To get rid of the ammonia, the liver converts it into a less toxic compound called urea, which can be safely transported to the kidneys for excretion in urine. Therefore, the liver plays a crucial role in removing excess nitrogen from the body, and the production of urea is an important part of this process.

Ka ìwé ẹ̀kọ́ nípa Respiration (JAMB)

Ka ìwé ẹ̀kọ́ nípa Population Studies By Sampling (WAEC)

Respiration

Population Studies By Sampling

Wo Idahun

Ibeere 14 Ìròyìn

Which of the following types of placentation is not common amongst syncarpous pistils?

Marginal Ìdáhùn tó tọ́

Axile

Parietal

Free central

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Classification (WAEC)

Classification

Wo Idahun

Ibeere 15 Ìròyìn

Which of the following groups of animals do not possess a nervous system?

Porifera Ìdáhùn tó tọ́

Cnidaria

Platyheminthes

Nematoda

Awọn alaye Idahun

The group of animals that do not possess a nervous system is Porifera. Porifera, also known as sponges, are simple, multicellular animals that lack organs and tissues. They do not have a true nervous system but can react to physical and chemical stimuli through specialized cells called choanocytes. These cells help in filtering water and capturing food particles, and they also respond to changes in the water flow and chemical composition. However, Porifera do not have a centralized nervous system like other animals and thus cannot process information or respond to stimuli in the same way.

Ka ìwé ẹ̀kọ́ nípa Mosses And Ferns (WAEC)

Ka ìwé ẹ̀kọ́ nípa Nervous Coordination (WAEC)

Ka ìwé ẹ̀kọ́ nípa Respiratory System (WAEC)

Mosses And Ferns

Nervous Coordination

Respiratory System

Wo Idahun

Ibeere 16 Ìròyìn

The natural dwelling place of an organism is called its

ecological niche

habitat Ìdáhùn tó tọ́

population

environment

Awọn alaye Idahun

The natural dwelling place of an organism is called its habitat. Habitat refers to the specific place or environment where an organism lives and obtains the resources it needs to survive, such as food, water, shelter, and space. It is the natural home or living place of an organism where it carries out its life activities. For example, the habitat of a fish may be a freshwater pond or river, while the habitat of a bird may be a forest or a grassland. The characteristics of the habitat, such as temperature, humidity, soil type, and the presence of other organisms, can affect the survival and reproduction of the organism. Therefore, habitat is an important concept in ecology and biology, as it plays a crucial role in determining the distribution and abundance of species in an ecosystem.

Ka ìwé ẹ̀kọ́ nípa Local (Nigerian) Biomes (JAMB)

Ka ìwé ẹ̀kọ́ nípa Natural Habitats (JAMB)

Ka ìwé ẹ̀kọ́ nípa The Ecology Of Populations (JAMB)

Local (Nigerian) Biomes

Natural Habitats

The Ecology Of Populations

Wo Idahun

Ibeere 17 Ìròyìn

Which of the following statements is not associated with pyramids of energy?

Efficiency of energy transfer between trophic levels can be studied

Comparisons of pyramids for different ecosystems can be made Ìdáhùn tó tọ́

More accurate comparisons of trophic levels

Representation of numbers of organisms at different trophic levels

Awọn alaye Idahun

More accurate comparisons of trophic levels is not associated with pyramids of energy. Pyramids of energy are graphical representations of the flow of energy through an ecosystem, showing the amount of energy transferred from one trophic level to the next. While pyramids can be used to compare the efficiency of energy transfer between trophic levels and make comparisons of pyramids for different ecosystems, they do not necessarily provide more accurate comparisons of trophic levels. The accuracy of the comparison depends on various factors such as the method used to measure the energy flow and the precision of the data used to construct the pyramid.

Ka ìwé ẹ̀kọ́ nípa Humans And Environment (JAMB)

Ka ìwé ẹ̀kọ́ nípa Food Webs And Trophic Levels (WAEC)

Humans And Environment

Food Webs And Trophic Levels

Wo Idahun

Ibeere 18 Ìròyìn

Which of the following cell organelles is the site for the production of ATP?

Lysosome

Nucleus

Mitochondrion Ìdáhùn tó tọ́

Ribosome

Awọn alaye Idahun

The cell organelle that is the site for the production of ATP is the mitochondrion. ATP stands for Adenosine Triphosphate, which is the energy currency of the cell. Mitochondria are known as the powerhouses of the cell because they are responsible for producing ATP through a process called cellular respiration. During cellular respiration, the mitochondria break down glucose and other molecules to release energy, which is stored in ATP molecules. The energy produced by the mitochondria is used by the cell to carry out various metabolic processes, including growth, repair, and movement. Therefore, the mitochondria play a crucial role in providing energy to the cell and are essential for the survival and functioning of the cell.

Ka ìwé ẹ̀kọ́ nípa Protein Synthesis (WAEC)

Protein Synthesis

Wo Idahun

Ibeere 19 Ìròyìn

The diagram above is an illustration of the urinary tubule in a mammal. The part which contains lowest concentration of urea is labelled

III Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Energy Transformation In Nature (WAEC)

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Energy Transformation In Nature

Excretory Systems And Mechanisms; Types Of Excretory Systems

Wo Idahun

Ibeere 20 Ìròyìn

Which of the following is NOT characteristic of social insects?

All members are identical Ìdáhùn tó tọ́

There is division of labour

The members dwell in the same habitat

Some members protect the queen

Awọn alaye Idahun

The characteristic that is NOT associated with social insects is "All members are identical". In social insects, there is division of labor where each member of the colony has a specific task to perform, such as foraging, building the nest, caring for the young, or defending the colony. The members dwell in the same habitat, which is typically the nest or colony, and some members protect the queen, who is responsible for producing offspring. However, social insects are not identical. They may have different physical characteristics or perform different tasks within the colony. For example, in a bee colony, worker bees are physically different from drones, and they have different roles and responsibilities within the colony. Similarly, in an ant colony, soldiers are larger and have a different body shape than workers. In summary, social insects are not identical, but they do exhibit division of labor, live in the same habitat, and have some members that protect the queen.

Ka ìwé ẹ̀kọ́ nípa Behavioural Adaptations In Social Animals (WAEC)

Behavioural Adaptations In Social Animals

Wo Idahun

Ibeere 21 Ìròyìn

Which of the following ecological factors will result in food shortage?

Drought Ìdáhùn tó tọ́

Low rate of reproduction

Emigration

Topography

Awọn alaye Idahun

Drought can result in food shortage. Drought is a prolonged period of dry weather that can lead to a shortage of water for plants, which can cause crops to fail and result in a shortage of food for both humans and animals. In areas where agriculture is heavily dependent on rain, drought can have a significant impact on food production and lead to food shortages. Low rate of reproduction, emigration, and topography are not directly related to food shortage. However, factors such as population growth and migration patterns can indirectly affect food production and availability. The shape and elevation of the land, or topography, can also impact agriculture, but it is not a direct cause of food shortage.

Ka ìwé ẹ̀kọ́ nípa Evolution (Recombination DNA) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecological Factors (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecosystem (WAEC)

Evolution (Recombination DNA)

Ecological Factors

Ecosystem

Wo Idahun

Ibeere 22 Ìròyìn

Which of the following groups of organisms do not have members that can be called autotrophs?

Protists

Mosses

Chlorophyta

Fungi Ìdáhùn tó tọ́

Awọn alaye Idahun

The group of organisms that do not have members that can be called autotrophs is Fungi. Autotrophs are organisms that are able to synthesize their own food using simple inorganic substances and an external energy source, such as sunlight. Autotrophs include plants, some protists, and some bacteria. Fungi, on the other hand, are heterotrophic organisms that obtain their nutrition by decomposing dead organic matter or by forming mutualistic relationships with other organisms. They do not have the ability to carry out photosynthesis or produce their own food, and therefore cannot be called autotrophs. In summary, fungi are not autotrophs, while protists, mosses, and Chlorophyta all have members that can be considered autotrophs.

Ka ìwé ẹ̀kọ́ nípa Organization Of Life (WAEC)

Organization Of Life

Wo Idahun

Ibeere 23 Ìròyìn

A good site for secondary succession would be

a sand dune

a bare rock

a land that has just had forest fire Ìdáhùn tó tọ́

a stretch of barren land

Awọn alaye Idahun

Wo Idahun

Ibeere 24 Ìròyìn

The establishment of game reserves and parks is a method of

conserving natural resources Ìdáhùn tó tọ́

cultivating game

controlling pollution

cultural awareness

Awọn alaye Idahun

The establishment of game reserves and parks is a method of conserving natural resources. Game reserves and parks are protected areas where wildlife and their habitats are preserved and protected. These areas are set aside to conserve biodiversity and protect rare and endangered species. By preserving these habitats, game reserves and parks help to conserve the ecosystem and the natural resources within it. The other options listed are not directly related to the establishment of game reserves and parks. Cultivating game involves raising and breeding game animals for hunting or other purposes, while controlling pollution involves reducing and managing environmental pollution. Cultural awareness refers to promoting understanding and appreciation of different cultures and traditions.

Ka ìwé ẹ̀kọ́ nípa Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecosystem (WAEC)

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

Ecosystem

Wo Idahun

Ibeere 25 Ìròyìn

Which of the labelled parts of the diagram of the part of the human skeleton articulates with the head of the trochlea to form a hinge joint?

II Ìdáhùn tó tọ́

III

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Cell Structure (WAEC)

Cell Structure

Wo Idahun

Ibeere 26 Ìròyìn

Which of the following practices is not used in conserving water?

Afforestation

Damming

Deforestation Ìdáhùn tó tọ́

Reforestation

Awọn alaye Idahun

Deforestation is not a practice used in conserving water. The opposite of deforestation is reforestation, which is a practice used in conserving water. Deforestation involves cutting down trees and removing forests, which can negatively impact the water cycle and lead to decreased water availability in the area. Reforestation, on the other hand, involves planting new trees and increasing forest cover, which can help improve water retention in the soil and promote a healthier water cycle. Afforestation and damming are also practices used in conserving water. Afforestation involves planting new trees to increase forest cover, while damming involves building structures such as dams to store water and regulate its flow. Both of these practices can help conserve water and improve water management in an area.

Ka ìwé ẹ̀kọ́ nípa Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

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

Wo Idahun

Ibeere 27 Ìròyìn

Which of the following function is associated with calcium in plants? Formation of

cell wall Ìdáhùn tó tọ́

ribosomes

proteins

cell membrane

Awọn alaye Idahun

The function associated with calcium in plants is the formation of the cell wall. Calcium is an important nutrient that is required for the proper development and strengthening of the cell wall in plant cells. It plays a crucial role in the formation of pectin, a component of the cell wall that helps to hold the cell walls of adjacent cells together. This allows the plant to maintain its structure and also helps to protect it from environmental stresses like wind and water. Additionally, calcium helps to regulate the transport of other nutrients and water into and out of the cell, and it is involved in the activation of enzymes that are important for growth and development.

Ka ìwé ẹ̀kọ́ nípa Modes Of Nutrition (WAEC)

Ka ìwé ẹ̀kọ́ nípa Plant Nutrition (WAEC)

Modes Of Nutrition

Plant Nutrition

Wo Idahun

Ibeere 28 Ìròyìn

The diagrams below show the dentition of an organism. The function of the teeth labelled X is for

biting and grasping

chewing and grinding

tearing and grasping Ìdáhùn tó tọ́

chewing and tearing

Awọn alaye Idahun

The function of the teeth labelled X is for tearing and grasping. The teeth labelled X are the canine teeth, which are the sharp, pointed teeth located next to the incisors in both jaws. The canine teeth are adapted for grasping and tearing food, and they play an important role in feeding on prey and in processing tough or fibrous foods. For example, in carnivorous animals, the canines are used for seizing and killing prey, while in omnivorous or herbivorous animals, the canines are used for tearing and shredding tough plant material, such as leaves or stems. The canines are also important in social interactions, such as aggression or threat displays. Therefore, the function of the teeth labelled X is for tearing and grasping, making them an essential part of the dentition of many animals.

Ka ìwé ẹ̀kọ́ nípa Support And Movement (JAMB)

Ka ìwé ẹ̀kọ́ nípa Cell Structure (WAEC)

Support And Movement

Cell Structure

Wo Idahun

Ibeere 29 Ìròyìn

Which of the following organisms cannot exist freely on its own?

Chlamydomonas

Amoeba

Paramecium

Plasmodium Ìdáhùn tó tọ́

Awọn alaye Idahun

The organism that cannot exist freely on its own is Plasmodium. Plasmodium is a parasitic protozoan that causes malaria in humans. It cannot survive outside of its host, which is typically a mosquito or a human. Plasmodium has a complex life cycle that involves both sexual and asexual reproduction, and it requires a specific set of environmental conditions to complete its life cycle. Once inside the host, the parasite invades the host's red blood cells and feeds on hemoglobin, which can cause severe anemia and other complications. Therefore, Plasmodium is entirely dependent on its host for survival and cannot exist freely on its own.

Ka ìwé ẹ̀kọ́ nípa Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

Wo Idahun

Ibeere 30 Ìròyìn

Which of the following actions does not occur during exhalation in man?

Thoracic cavity decreases in volume

Diaphragm flattens Ìdáhùn tó tọ́

Ribs move down and in

Air pressure increases in the thoracic cavity

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Respiratory System (WAEC)

Respiratory System

Wo Idahun

Ibeere 31 Ìròyìn

Which of the following glands also serves as an exocrine gland?

Ovary

Pancreas Ìdáhùn tó tọ́

Adrenal

Thyroid

Awọn alaye Idahun

The Pancreas serves as both an endocrine gland and an exocrine gland. An endocrine gland is a gland that produces hormones and releases them into the bloodstream to regulate various bodily functions. The Pancreas produces hormones such as insulin and glucagon which regulate the body's blood sugar levels. On the other hand, an exocrine gland is a gland that releases substances through ducts directly into a target organ or tissue. The Pancreas also has exocrine functions, as it releases digestive enzymes into the small intestine to help break down food. So, the Pancreas has both endocrine and exocrine functions.

Ka ìwé ẹ̀kọ́ nípa Blood Transfusion (WAEC)

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Blood Transfusion

Excretory Systems And Mechanisms; Types Of Excretory Systems

Wo Idahun

Ibeere 32 Ìròyìn

One of the structural adaptations of mammals for movement on land is the development of the

hollow bones

pentadactyl limb Ìdáhùn tó tọ́

fused thoracic bones

streamlined body

Awọn alaye Idahun

The development of the pentadactyl limb is one of the structural adaptations of mammals for movement on land. This means that mammals have five digits (fingers or toes) on each limb, which allows for a wide range of movement and the ability to grasp and manipulate objects. This adaptation helps mammals to move more effectively on land, allowing them to climb, run, jump, and perform other movements necessary for survival.

Ka ìwé ẹ̀kọ́ nípa Irritability As A Basic Characteristic Of Protoplasm (WAEC)

Irritability As A Basic Characteristic Of Protoplasm

Wo Idahun

Ibeere 33 Ìròyìn

The structural similarities in Paramecium and Euglena are in the

shape of locomotory organs

blunt anterior and pointed posterior Ìdáhùn tó tọ́

presence of micro and mega nuclei in both

presence of anterior and posterior contractile vacuoles

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Amoeba, Paramecium, And Euglena (WAEC)

Amoeba, Paramecium, And Euglena

Wo Idahun

Ibeere 34 Ìròyìn

Which of the following pairs of organisms is in a mutualistic relationship?

Hydra and Sea anemone

Hermit crab and Sea anemone Ìdáhùn tó tọ́

Dodder plant and Cocoa plant

Mistletoe and Kolanut

Awọn alaye Idahun

The pair of organisms that is in a mutualistic relationship is the Hermit crab and Sea anemone. In this relationship, the hermit crab provides protection and transportation for the sea anemone, while the sea anemone provides the hermit crab with defense against predators. The sea anemone attaches itself to the shell of the hermit crab and uses its stinging tentacles to deter potential predators. In return, the hermit crab provides the sea anemone with food and a means of transportation to new food sources. Therefore, the hermit crab and sea anemone have a mutualistic relationship because both organisms benefit from the interaction.

Ka ìwé ẹ̀kọ́ nípa Symbiotic Interactions Of Plants And Animals (JAMB)

Symbiotic Interactions Of Plants And Animals

Wo Idahun

Ibeere 35 Ìròyìn

The organism that can carry out both autotropic and heterotrophic modes of nutritions is

Chlamydomonas

Eudorina

Euglena Ìdáhùn tó tọ́

Spirogyra

Awọn alaye Idahun

The organism that can carry out both autotrophic and heterotrophic modes of nutrition is Euglena. Euglena is a unicellular organism that belongs to the kingdom Protista. It has a unique feature of having both plant-like and animal-like characteristics. Like plants, Euglena can carry out photosynthesis using chloroplasts to produce their food. In this mode, they are autotrophic. However, Euglena can also feed on organic matter in their environment when sunlight is not available for photosynthesis. In this mode, they are heterotrophic. Euglena can engulf food particles using their flexible pellicle and form a food vacuole for digestion. This ability to switch between autotrophic and heterotrophic modes of nutrition makes Euglena a very adaptable and versatile organism. It allows them to survive in different environments where sunlight and organic matter are not always available.

Ka ìwé ẹ̀kọ́ nípa Modes Of Nutrition (WAEC)

Ka ìwé ẹ̀kọ́ nípa Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Modes Of Nutrition

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

Wo Idahun

Ibeere 36 Ìròyìn

The type of variation illustrated above is

continuous variation

discontinuous variation Ìdáhùn tó tọ́

morphological variation

environmental variation

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Physiological Variations (WAEC)

Physiological Variations

Wo Idahun

Ibeere 37 Ìròyìn

Which of the following sequences is the correct route of the transmission of impulses along a reflex arc?

\(Receptor\to sensory neuron \to synapse \to intermediate neuron \to synapse \to motor neuron \to effector\) Ìdáhùn tó tọ́

\(Receptor \to motor neuron \to synapse \to intermediate neuron \to synapse \to sensory neuron \to effector\)

\(Effector \to intermediate neuron \to synapse \to motor neuron \to synapse \to sensory neuron \to receptor\)

\(Effector \to motor neuron \to synapse \to sensory neuron \to synapse \to intermediate neuron \to receptor\)

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Nervous Coordination (WAEC)

Nervous Coordination

Wo Idahun

Ibeere 38 Ìròyìn

The diagram above illustrates the transverse section of a

dicotyledonous root

monocotyledonous root

dicotyledonous stem Ìdáhùn tó tọ́

monocotyledonous stem

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Morphology Of Monocotyledonous And Dicotyledonous Plants

Wo Idahun

Ibeere 39 Ìròyìn

The diagram above shows the dentition of an organism. What organism is this?

rabbit

cat

frog

man Ìdáhùn tó tọ́

Awọn alaye Idahun

Wo Idahun

Ibeere 40 Ìròyìn

A population which exceeds its carrying capacity and then collapses is represented graphically by a

bell-shaped curve Ìdáhùn tó tọ́

linear curve

sigmoid curve

skewed curve

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Co-ordination And Control (JAMB)

Co-ordination And Control

Wo Idahun

Ibeere 41 Ìròyìn

Soil permeability refers to

how easily water passes through the soil Ìdáhùn tó tọ́

the proportion of air in the soil

the proportion of water the soil holds

how well water rises up the soil

Awọn alaye Idahun

Soil permeability refers to how easily water passes through the soil. It is a measure of the rate at which water can move through soil pores or spaces between soil particles. Soils with high permeability allow water to pass through quickly, while soils with low permeability restrict the movement of water. Permeability is determined by various factors, such as soil texture, structure, compaction, and organic matter content. Coarse-textured soils with larger pore spaces, such as sandy soils, generally have high permeability, while fine-textured soils with smaller pore spaces, such as clay soils, have low permeability. Soil permeability is an important property that affects plant growth and water availability, as it influences the rate at which water can move through soil and reach plant roots.

Ka ìwé ẹ̀kọ́ nípa Soil (WAEC)

Soil

Wo Idahun

Ibeere 42 Ìròyìn

An apple plant can produce sexually and asexually and it has 40 chromosomes in its leaf cells. How many chromosomes would be in each gamete and somatic cell?

20 chromosomes in the gametes and 10 in the somatic cells

40 chromosomes in the gametes and 20 in the somatic cells

20 chromosomes in the gametes and 40 in the somatic cells Ìdáhùn tó tọ́

40 chromosomes in the gametes and 40 in the somatic cells

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Chromosomes: The Basis Of Heredity (WAEC)

Chromosomes: The Basis Of Heredity

Wo Idahun

Ibeere 43 Ìròyìn

The complex energy-rich organic matter which living organisms need for life is

water

air

food Ìdáhùn tó tọ́

mineral salts

Awọn alaye Idahun

The complex energy-rich organic matter which living organisms need for life is food. Food provides the energy and nutrients that living organisms need to carry out their metabolic processes, grow, and reproduce. Food contains various molecules such as carbohydrates, proteins, and fats that the body breaks down into simpler forms through digestion and then utilizes to provide energy and building blocks for the body's cells. Without food, organisms would not be able to survive as they would not have the necessary energy and resources to carry out life-sustaining activities.

Ka ìwé ẹ̀kọ́ nípa Nutrition (JAMB)

Nutrition

Wo Idahun

Ibeere 44 Ìròyìn

Which of the following pyramids gives the most accurate picture of the relationships between at the various trophic levels in a food chain? A pyramid of

numbers

energy Ìdáhùn tó tọ́

biomass

size

Awọn alaye Idahun

The pyramid of energy gives the most accurate picture of the relationships between the various trophic levels in a food chain. This is because energy is lost at each level due to metabolic processes, so there is less energy available to the organisms at higher trophic levels. Therefore, the pyramid of energy shows the decreasing amount of energy available at each level, with the producers at the bottom and the top predators at the top. This pyramid provides a clearer and more accurate representation of the energy flow through a food chain than other pyramids, such as those based on numbers or biomass. This is because energy flow is a unidirectional process, and it reflects the actual transfer of energy from one trophic level to another in a food chain.

Ka ìwé ẹ̀kọ́ nípa Integrated Water Resources Management (WAEC)

Ka ìwé ẹ̀kọ́ nípa Food Webs And Trophic Levels (WAEC)

Integrated Water Resources Management

Food Webs And Trophic Levels

Wo Idahun

Ibeere 45 Ìròyìn

The teeth which are absent in the young of the organism whose dentition is shown above is labelled

Z Ìdáhùn tó tọ́

Awọn alaye Idahun

Wo Idahun

Ibeere 46 Ìròyìn

In the diagram of the human sperm above, the function of the part labelled II is to

fuse the ovum during fertilization

generate the energy for the sperm to swim to the fallopian tube

help the sperm to swim forward Ìdáhùn tó tọ́

dissolve the membrane of the egg during fertilization

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Growth (JAMB)

Ka ìwé ẹ̀kọ́ nípa The Cell And Its Environment: Physical And Biophysical Processes (WAEC)

Growth

The Cell And Its Environment: Physical And Biophysical Processes

Wo Idahun

Ibeere 47 Ìròyìn

Which of the following processes are associated with photosynthesis? I. Energy from sunlight is absorbed II. Carbon dioxide is evolved III. Oxygen is given off IV. Glucose is synthesized

I and II only

I, II and IV only

I, III and IV only Ìdáhùn tó tọ́

I, II, III and IV

Awọn alaye Idahun

The processes associated with photosynthesis are I, III, and IV only. During photosynthesis, energy from sunlight is absorbed by specialized pigment molecules in plant cells called chlorophyll. This energy is then used to convert carbon dioxide from the air and water from the soil into glucose, a simple sugar molecule that is used for energy and as a building block for other organic molecules. Oxygen is also produced as a by-product of this process and is released into the air. Therefore, options I, III, and IV are the correct processes associated with photosynthesis as carbon dioxide is not evolved during this process.

Ka ìwé ẹ̀kọ́ nípa Properties And Functions Of The Living Cell (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecosystem (WAEC)

Properties And Functions Of The Living Cell

Ecosystem

Wo Idahun

Ibeere 48 Ìròyìn

The diagram above illustrates a part of the human skeleton. The labelled part that provides surface for the attachment of the triceps is

III Ìdáhùn tó tọ́

Awọn alaye Idahun

The labelled part that provides a surface for the attachment of the triceps is part III. The triceps muscle is located at the back of the upper arm and is responsible for extending the arm at the elbow joint. It has three heads, and the long head of the triceps attaches to the scapula bone and the lateral and medial heads attach to the humerus bone of the upper arm. Part III of the diagram represents the humerus bone, and the bony protrusion on the back of the bone is called the olecranon process. This process provides a surface for the attachment of the tendon of the triceps muscle, allowing it to extend and straighten the arm at the elbow joint.

Wo Idahun

Ibeere 49 Ìròyìn

The diagram above is an illustration of the human sperm. The part labelled I is the

acrosome Ìdáhùn tó tọ́

nucleus

mitochondrion

tail

Awọn alaye Idahun

The part labelled I in the human sperm diagram is the acrosome. The acrosome is a specialized structure that covers the head of the sperm. It contains digestive enzymes that are necessary for the sperm to penetrate the protective layers of the egg during fertilization. When the sperm reaches the egg, the acrosome releases these enzymes, which break down the outer membrane of the egg and allow the sperm to enter and fertilize it. Therefore, the acrosome is a critical structure in the process of fertilization and is responsible for facilitating the fusion of the sperm and egg.

Ka ìwé ẹ̀kọ́ nípa Theories Of Evolution (JAMB)

Theories Of Evolution

Wo Idahun






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