JAMB UTME - Biology - 1993 | Green Bridge CBT

Question 1 Rapport

Two organisms of different species, living in close association but not dependent on each other are referred to as

parasites

commensals

symbionts

autotrophs Bonne réponse

Détails de la réponse

Lisez la note de cours sur Symbiotic Interactions Of Plants And Animals (JAMB)

Lisez la note de cours sur Evidence Of Evolution (JAMB)

Lisez la note de cours sur Natural Habitats (JAMB)

Symbiotic Interactions Of Plants And Animals

Evidence Of Evolution

Natural Habitats

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Question 2 Rapport

This lower jaw is typical of a

sheep Bonne réponse

rabbit

dog

cat

Détails de la réponse

Voir la réponse

Question 3 Rapport

interveinal chlorosis is normally associated with the deficiency of

magnesium Bonne réponse

potassium

iron

calcium

Détails de la réponse

Interveinal chlorosis is a condition in plants where the leaf tissue between the veins turns yellow while the veins remain green. This condition is usually associated with the deficiency of magnesium. Magnesium is an important element for plant growth and is necessary for chlorophyll production, which gives plants their green color. When magnesium is deficient, the plant cannot produce enough chlorophyll, leading to the yellowing of the leaves.

Lisez la note de cours sur Classification (WAEC)

Lisez la note de cours sur Co-ordination And Control (JAMB)

Classification

Co-ordination And Control

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Question 4 Rapport

The butterfly is of great economic importance because

of its use in scientific studies

it sucks nectar from flowers

it adds to the beauty of the enviroment

it polllinates flowers of crops and other plants Bonne réponse

Détails de la réponse

The butterfly is of great economic importance because it plays a vital role in the pollination of flowers of crops and other plants. Butterflies have long, slender tongues that can reach deep into flowers to suck nectar. In the process of collecting nectar, the butterfly transfers pollen from the male flower part (stamen) to the female flower part (pistil) of the same or different flowers, resulting in fertilization and fruit or seed production. This makes butterflies important pollinators that contribute to the growth and productivity of many plant species, including those that are economically important to humans.

Voir la réponse

Question 5 Rapport

Which of the following is an example of discontinuous variation observed in man?

Skin colours

Tongue rolling Bonne réponse

Body weight

Height

Détails de la réponse

Tongue rolling is an example of discontinuous variation observed in man. Discontinuous variation refers to distinct categories or traits that are either present or absent in a population. In the case of tongue rolling, some individuals can roll their tongues while others cannot, making it a clear example of a trait that is either present or absent without any intermediate variations. This is different from continuous variation, which refers to traits that vary along a continuum, such as height or body weight.

Lisez la note de cours sur Physiological Variations (WAEC)

Physiological Variations

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Question 6 Rapport

In H, the cotyledons are carried above the soil because

the epicotyl grows faster than the hypocotyl

the hypocotyl grows faster than the epicotyl Bonne réponse

both grow at the same rate

the epicotyl outgrow the radicle

Détails de la réponse

The cotyledons in H are carried above the soil because the hypocotyl grows faster than the epicotyl. The hypocotyl is the embryonic stem of the plant and is responsible for pushing the cotyledons out of the soil. As it grows, it elongates and lifts the cotyledons, exposing them to light for photosynthesis. This process is known as hypocotyl elongation, and it allows the plant to establish itself and start growing towards maturity.

Lisez la note de cours sur Nutrition (JAMB)

Nutrition

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Question 7 Rapport

Flame cells are the

excretory system of worms

excretory and respiratory systems of flatworms

secretory syustem of flatworms

excretory system of flatworms Bonne réponse

Détails de la réponse

Flame cells are the excretory system of flatworms. Flatworms do not have a true circulatory or respiratory system, and so they rely on a network of flame cells to filter out waste products and excess water from their bodies. These specialized cells are located on the sides of the flatworms' bodies and contain tiny hair-like structures called cilia. The cilia beat in a coordinated manner to create a current of fluid that draws waste products and excess water into the flame cells. The waste products are then eliminated from the body through tiny openings called nephridiopores.

Lisez la note de cours sur Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Lisez la note de cours sur Properties And Functions Of The Living Cell (WAEC)

Excretory Systems And Mechanisms; Types Of Excretory Systems

Properties And Functions Of The Living Cell

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Question 8 Rapport

Carbon monoxide poisons tissue by

constricting the blood vessels

killing the cells

combining with haemoglobin Bonne réponse

rupturing the blood vessels

Détails de la réponse

Carbon monoxide poisons tissue by combining with haemoglobin. Carbon monoxide has a greater affinity for haemoglobin than oxygen does, meaning it can bind with haemoglobin molecules in the blood more easily. This reduces the amount of haemoglobin available to carry oxygen to the body's tissues. As a result, the body's tissues are deprived of oxygen, which can lead to tissue damage or death. This is why carbon monoxide is sometimes referred to as the "silent killer" – it is odorless, colorless, and tasteless, making it difficult to detect without special equipment.

Lisez la note de cours sur Classification (WAEC)

Classification

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Question 9 Rapport

Which of the labelled parts is the diastema?

3 Bonne réponse

Détails de la réponse

The diastema is labelled as part 3. A diastema is a gap or space between two teeth, often seen in mammals with elongated canines such as dogs or in some primates. In the case of the labelled image, the diastema is the gap between the canine tooth (part 2) and the first premolar tooth (part 4). This gap in the teeth allows for a larger range of motion of the jaw and can help in grasping and tearing food.

Lisez la note de cours sur Ecological Management: Tolerance, Minimum And Maximum (WAEC)

Ecological Management: Tolerance, Minimum And Maximum

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Question 10 Rapport

The end products of the digestion of fats and oils in mammals are

maltose and fatty acid

amino acids and glucose

fatty acid and fructose

fatty acids and glycerin Bonne réponse

Détails de la réponse

The end products of the digestion of fats and oils in mammals are fatty acids and glycerin. During digestion, fats and oils are broken down by enzymes called lipases, which break them down into their constituent parts of fatty acids and glycerin. These end products can then be absorbed into the bloodstream and transported to cells throughout the body to be used for energy or stored as fat.

Lisez la note de cours sur Nutrition (JAMB)

Nutrition

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Question 11 Rapport

The function of the structure labelled G is to

carry out initial photosynthesis for the seedlings Bonne réponse

protect the young leaves from mechanical damage

protect the young leaves from sun light

protect the young leaves from insects pest

Détails de la réponse

Lisez la note de cours sur Animal Nutrition (WAEC)

Lisez la note de cours sur Plant Nutrition (WAEC)

Lisez la note de cours sur Regulation Of Internal Environment (WAEC)

Lisez la note de cours sur Physiological Variations (WAEC)

Animal Nutrition

Plant Nutrition

Regulation Of Internal Environment

Physiological Variations

Voir la réponse

Question 12 Rapport

In which of the features do bryophytes differ from pteridophytes?

Absence of flower

Alternation of generation

Dependency on water for reproduction

Presence of vascular system Bonne réponse

Détails de la réponse

Bryophytes differ from pteridophytes in their dependency on water for reproduction. Bryophytes, which include mosses and liverworts, are small, non-vascular plants that require water for the sperm to swim to the egg. Pteridophytes, which include ferns and horsetails, have a vascular system that allows them to transport water and nutrients and do not require water for the sperm to swim to the egg. Other options are not the distinguishing features between bryophytes and pteridophytes.

Voir la réponse

Question 13 Rapport

At which trophic level would the highest accumulation of a non-biodegradable substance occur?

Primary producers

Tertiary consumers Bonne réponse

Primary consumers

Secondary consumers

Détails de la réponse

The highest accumulation of a non-biodegradable substance would occur in the trophic level of tertiary consumers. This is because non-biodegradable substances, such as heavy metals or persistent organic pollutants, tend to accumulate in the bodies of organisms over time, and as we move up the food chain, the concentration of these substances becomes increasingly magnified. Tertiary consumers are at the top of the food chain, and thus, they accumulate the highest concentrations of non-biodegradable substances.

Voir la réponse

Question 14 Rapport

Which of the following is the correct order of the developmental stages?

1->2->3->4->5

5->1->3->2->4

2->1->3->4->5

5->3->2->1->4 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Properties And Functions Of The Living Cell (WAEC)

Properties And Functions Of The Living Cell

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Question 15 Rapport

Stage 3 breathes

with the lungs

with the external gills

with the internal gills

through the skin Bonne réponse

Détails de la réponse

Lisez la note de cours sur Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Lisez la note de cours sur Respiratory System (WAEC)

Morphology Of Monocotyledonous And Dicotyledonous Plants

Respiratory System

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Question 16 Rapport

After circulation in the lungs, the blood returns to the left auricle through

6 Bonne réponse

Détails de la réponse

Lisez la note de cours sur Respiratory System (WAEC)

Respiratory System

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Question 17 Rapport

The most important physical factor which affects an organism living in the intertidal zone of the seashore is

salinity

wave action Bonne réponse

temperature

Détails de la réponse

The most important physical factor which affects an organism living in the intertidal zone of the seashore is wave action. The intertidal zone is the area between the highest tide and the lowest tide. Organisms that live in this zone must be able to withstand exposure to air and water, as well as the constant pounding of waves. The strength of the waves and the frequency with which they occur can affect an organism's ability to feed, reproduce, and maintain its position on the shore. Therefore, wave action is the most important physical factor that influences the distribution and abundance of intertidal organisms.

Lisez la note de cours sur Relevance Of Biology To Agriculture (WAEC)

Relevance Of Biology To Agriculture

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Question 18 Rapport

On what structure are the units of inheritance situated?

Golgi bodies

Ribosomes

Chromosomes Bonne réponse

Endoplasmic reticulum

Détails de la réponse

The units of inheritance, which are genes, are situated on chromosomes. Chromosomes are long, coiled-up strands of DNA (deoxyribonucleic acid) molecules that carry an organism's genetic information. Genes are specific sections of DNA that encode for particular traits or characteristics of an organism, such as eye color or height. When cells divide, the chromosomes replicate and the copies are distributed to the daughter cells, ensuring that each new cell receives a complete set of genetic information.

Lisez la note de cours sur Chromosomes: The Basis Of Heredity (WAEC)

Chromosomes: The Basis Of Heredity

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Question 19 Rapport

Production of naked seeds is a distinctive feature of the group of plant called

grasses

conifers Bonne réponse

legumes

palms

Détails de la réponse

The group of plants that produces naked seeds is conifers. Conifers are a group of plants that includes trees and shrubs with needle-like or scale-like leaves. They produce cones that contain the male and female reproductive structures, and these cones protect the seeds until they are mature. Unlike flowering plants, conifers do not produce fruit to protect their seeds, hence the term "naked seeds".

Lisez la note de cours sur Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

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Question 20 Rapport

In which of the following organism does a single cells performs all the function of movement, nutrition, growth , excretion, photosynthesis?

Paramecium

Euglena Bonne réponse

Amoeba

Spirogyra

Détails de la réponse

Lisez la note de cours sur Amoeba, Paramecium, And Euglena (WAEC)

Lisez la note de cours sur Spirogyra And Rhizopus (WAEC)

Amoeba, Paramecium, And Euglena

Spirogyra And Rhizopus

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Question 21 Rapport

The bright colours of the comb and feathers in the peacock are for

sex differenciation

beauty

courtship Bonne réponse

defence

Détails de la réponse

The bright colours of the comb and feathers in the peacock are for courtship purposes. Peacock feathers are a classic example of sexual selection, where males develop traits that are attractive to females for the purposes of mating. The bright colors of the feathers and the elaborate courtship displays performed by male peacocks are intended to attract the attention of females and increase the likelihood of successful mating. The colors and displays are not for defense or camouflage, but rather to increase reproductive success.

Voir la réponse

Question 22 Rapport

In the illustration above, the genotypes of the offsprings are

1 heterozygous smooth : 2 homozygous smooth : 1 wrinkled

1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled Bonne réponse

2 homozygous smooth : 2 wrinkled

3 heterozygous smooth : 2 wrinkled

Détails de la réponse

Lisez la note de cours sur Behavioural Adaptations In Social Animals (WAEC)

Lisez la note de cours sur Application Of The Principles Of Heredity (WAEC)

Behavioural Adaptations In Social Animals

Application Of The Principles Of Heredity

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Question 23 Rapport

Which group of plants would be the first colonizers in an ecological succession changing rocks to soil?

Mosses

Ferns

Lichens Bonne réponse

Grasses

Détails de la réponse

Lichens would be the first colonizers in an ecological succession changing rocks to soil. Lichens are symbiotic organisms that consist of a fungus and an alga or cyanobacterium. They are able to grow on bare rocks and start breaking them down into soil by secreting acids that dissolve the rock surface. The breakdown of rocks and the accumulation of organic matter in the lichen thalli contribute to the formation of soil. This process is the first step in ecological succession, where plants and other organisms gradually colonize a barren area and change its ecological community over time.

Voir la réponse

Question 24 Rapport

Blood is pumped into the right ventricle by the contraction of the auricle wall through

Bonne réponse

Détails de la réponse

Voir la réponse

Question 25 Rapport

Members of the phylum protozoa use the contractile vacuole

to remove excess food

for movement

for digestion

to remove excess water Bonne réponse

Détails de la réponse

Members of the phylum Protozoa use the contractile vacuole to remove excess water. Protozoa are unicellular organisms that are found in various habitats such as freshwater, marine water, and soil. They need to maintain a balance of water and solutes in their cytoplasm to carry out various cellular functions. The contractile vacuole is a specialized organelle that helps in regulating this balance by collecting excess water and expelling it out of the cell through a pore. This helps in preventing the cell from bursting due to excess water intake, which is important for the survival of the organism.

Lisez la note de cours sur Amoeba, Paramecium, And Euglena (WAEC)

Amoeba, Paramecium, And Euglena

Voir la réponse

Question 26 Rapport

The main function of blood in mammals is to transport

excretory materials from tissues Bonne réponse

carbondioxide from lungs to tissues

digested food from all the body tissues

oxygen to the lungs

Détails de la réponse

Lisez la note de cours sur Transport System (WAEC)

Lisez la note de cours sur Support And Movement (JAMB)

Transport System

Support And Movement

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Question 27 Rapport

Which of the following organisms has lost the pentadactyl limb structure?

Bat

Fish

Frog Bonne réponse

Pigeon

Détails de la réponse

Voir la réponse

Question 28 Rapport

Osmic acid boiled with a solution of food substance gave a black precipitate. This indicates the presence of

fats and oil Bonne réponse

proteins

amino acids

starch

Détails de la réponse

The presence of a black precipitate after boiling a solution of a food substance with osmic acid indicates the presence of fats and oils. Osmic acid is a chemical reagent that is used to detect the presence of unsaturated lipids, such as fats and oils, which react with osmic acid to form a black precipitate. This reaction is a specific test for the presence of fats and oils and is commonly used in food analysis.

Lisez la note de cours sur Biotechnology (WAEC)

Lisez la note de cours sur Alimentary System (WAEC)

Biotechnology

Alimentary System

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Question 29 Rapport

Cold blooded animals are referred to as

poikilothermic Bonne réponse

homothermic

polythermic

homeostatic

Détails de la réponse

Cold-blooded animals are referred to as poikilothermic. This means that their body temperature is not internally regulated and varies with the temperature of their environment. In other words, their body temperature is not constant, and they are unable to maintain a steady internal temperature like warm-blooded animals. Examples of cold-blooded animals include reptiles, amphibians, and fish.

Lisez la note de cours sur Biotechnology (WAEC)

Biotechnology

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Question 30 Rapport

Important abiotic factors which affects all plants and animals in the habitat are

temperature and turbidity

rainfall and relative humididty

salinity and wind direction

temperature and rainfall Bonne réponse

Détails de la réponse

Abiotic factors are non-living components of an ecosystem that affect living organisms. Temperature and rainfall are two important abiotic factors that affect all plants and animals in a habitat. Temperature affects the rate of metabolic processes in plants and animals, while rainfall affects the availability of water, which is essential for survival. Therefore, fluctuations in temperature and rainfall can have significant impacts on the distribution and abundance of species in a given ecosystem. Other abiotic factors such as salinity and wind direction may also be important depending on the specific habitat.

Lisez la note de cours sur Respiration (JAMB)

Lisez la note de cours sur Ecosystem (WAEC)

Respiration

Ecosystem

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Question 31 Rapport

What would happen to a man whose pancreas has been surgically removed?

The level of blood sugar would increase Bonne réponse

The glycogen content of the liver would increase

His blood pressure would decrease

His weight would increase appreciably

Détails de la réponse

The pancreas is an important organ in the human body that produces insulin, a hormone that regulates the level of sugar in the blood. When the pancreas is surgically removed, the body loses its ability to produce insulin, and as a result, the level of sugar in the blood increases. This condition is called diabetes, which can lead to various complications if not managed properly. Therefore, option A is the correct answer. The other options are not related to the function of the pancreas, and thus, they are incorrect.

Lisez la note de cours sur Support And Movement (JAMB)

Support And Movement

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Question 32 Rapport

In the mammal, the autonomic nervous system consists of

sympathetic and parasympathetic system Bonne réponse

brain and spinal nerves

brain and cranial nerves

spinal cord and spinal nerves

Détails de la réponse

The autonomic nervous system in mammals is responsible for controlling involuntary functions such as heart rate, digestion, and breathing. It consists of two main components: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system prepares the body for "fight or flight" responses in times of stress, while the parasympathetic nervous system helps to regulate the body's "rest and digest" responses. Together, these systems work to maintain homeostasis in the body.

Lisez la note de cours sur Evidence Of Evolution (JAMB)

Lisez la note de cours sur Nervous Coordination (WAEC)

Evidence Of Evolution

Nervous Coordination

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Question 33 Rapport

During blood transfusion, agglutination may occur when

contrasting antigens reacts with contrasting antibodies

similar antigens react with similar antibodies Bonne réponse

two different antigens react with each other

two different antibodies react with each other

Détails de la réponse

Lisez la note de cours sur Crime Detection (WAEC)

Crime Detection

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Question 34 Rapport

What ecological condition favours the breeding of black flies?

Fresh water habitat

Water in ponds and swamp Bonne réponse

Water in small containers

Fast flowing streams

Détails de la réponse

Lisez la note de cours sur Ecological Components (WAEC)

Lisez la note de cours sur Natural Habitats (JAMB)

Lisez la note de cours sur Ecosystem (WAEC)

Ecological Components

Natural Habitats

Ecosystem

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Question 35 Rapport

Soil fertility can be conserved and renewed by

yearly monocropping

crop rotation and cover crops Bonne réponse

bush burning to remove unwanted debris

avoiding artificial manures

Détails de la réponse

Soil fertility can be conserved and renewed by crop rotation and cover crops. Crop rotation involves changing the crop planted in a particular field each growing season, which helps to prevent depletion of soil nutrients and build up of soil-borne pests and diseases. Cover crops are crops that are grown specifically to protect and enrich the soil rather than for harvest. They help to reduce soil erosion, add organic matter to the soil, and fix nitrogen from the atmosphere, which can improve soil fertility. Together, these practices help to maintain and improve soil fertility over time, which is important for sustainable agriculture.

Lisez la note de cours sur Soil (JAMB)

Lisez la note de cours sur Soil (WAEC)

Soil

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Question 36 Rapport

Which of the following is TRUE of the process of conjugation in paramecium?

Micronucleus disintegrates

Each ex-conjugant divides only once

Macronucleus undergoes division

Each micronucleus divides twice Bonne réponse

Détails de la réponse

During conjugation in Paramecium, the micronuclei of two individuals undergo meiosis to produce haploid micronuclei, which then undergo mitosis to form four haploid micronuclei in each cell. One of the haploid micronuclei in each cell is exchanged between the two conjugating individuals, and the exchanged micronuclei fuse with the micronuclei of the recipient individual, resulting in the formation of a diploid micronucleus. This process results in genetic recombination. Therefore, the statement that is true of the process of conjugation in Paramecium is that each micronucleus divides twice.

Lisez la note de cours sur Amoeba, Paramecium, And Euglena (WAEC)

Amoeba, Paramecium, And Euglena

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Question 37 Rapport

The main function of the petal of a flower is to

attract pollination agents Bonne réponse

protect the flower while still in bud

serve as landing stage for insects

protect the inner paisr from desiccation

Détails de la réponse

The main function of the petal of a flower is to attract pollination agents. Petals are often brightly colored and have distinctive shapes to attract pollinators such as insects, birds, and bats. The scent of the petals also helps in attracting these pollinators. When the pollinator lands on the petals, it picks up or deposits pollen, which helps in the reproduction of the plant. Therefore, petals play a crucial role in the process of pollination and the reproductive success of the plant.

Lisez la note de cours sur Internal Structure Of A Flowering Plant (JAMB)

Internal Structure Of A Flowering Plant

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Question 38 Rapport

Which of the following organs or cells components are common to both the sporophytes and the gametophytes of a fern?

Rhizoids

Roots

Chloroplast Bonne réponse

Leaves

Détails de la réponse

The option that is common to both sporophytes and gametophytes of a fern is chloroplasts. Chloroplasts are organelles found in plant cells and some algae that are responsible for photosynthesis. Both sporophytes and gametophytes in ferns have chloroplasts which enable them to produce food (carbohydrates) through photosynthesis. Rhizoids are root-like structures that are found in gametophytes of ferns, while roots are only found in sporophytes. Leaves are also only found in sporophytes of ferns. Therefore, chloroplast is the correct answer.

Voir la réponse

Question 39 Rapport

In which of the following organisms would glycogen be stored?

Spirogyra

Chlamydomonas

Rattus Bonne réponse

Magnifera

Détails de la réponse

Glycogen is a type of carbohydrate that is used as an energy source and stored in the liver and muscles of animals. Therefore, the organism that would store glycogen is the Rattus, which is a type of rodent commonly known as a rat. The other options, Spirogyra and Chlamydomonas, are both types of algae and do not have the ability to store glycogen. Magnifera, on the other hand, is the scientific name for mango, which is a fruit and not an organism that would store glycogen.

Lisez la note de cours sur Cell Structure (WAEC)

Cell Structure

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Question 40 Rapport

The response shown by the tips of the root and shoot of a plant to the stimulus of gravity is

haptotropism

phototropism

hydrotropism

geotropism Bonne réponse

Détails de la réponse

The response shown by the tips of the root and shoot of a plant to the stimulus of gravity is called geotropism. Geotropism is the growth of a plant in response to gravity. The roots of the plant show positive geotropism and grow towards the direction of gravity, i.e., downwards, while the shoot of the plant shows negative geotropism and grows against the direction of gravity, i.e., upwards. This response helps the plant to anchor itself in the soil and grow towards the source of light for photosynthesis.

Lisez la note de cours sur Excretory System (WAEC)

Lisez la note de cours sur Reproduction (Physical Changes In Males And Females) (WAEC)

Excretory System

Reproduction (Physical Changes In Males And Females)

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Question 41 Rapport

Which of the following is the correct order of the vertebrae along the spinal column?

Axis → atlas → thoracic → lumbar → cervical → sacral

Atlas → cervical → axis → thoracic → lumbar→ sacral

Atlas → axis → cervical → thoracic → lumbar → sacral Bonne réponse

Axis → atlas → cervical → thoracic → sacral → lumbar

Détails de la réponse

The correct order of the vertebrae along the spinal column is "Atlas → axis → cervical → thoracic → lumbar → sacral". The atlas is the first cervical vertebra, followed by the axis which is the second cervical vertebra. After that, there are several cervical vertebrae, followed by thoracic, lumbar, and sacral vertebrae. The sacrum is formed by the fusion of five vertebrae and is followed by the coccyx, which is formed by the fusion of three to five small vertebrae.

Lisez la note de cours sur Tissues And Supporting Systems: (WAEC)

Tissues And Supporting Systems:

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Question 42 Rapport

The spores of mucor are dispersed by

water

wind Bonne réponse

insects

explosive mechanism

Détails de la réponse

The spores of mucor are dispersed by the wind. Mucor is a type of fungi that reproduces asexually by producing large numbers of spores. These spores are light and small, and they can be easily carried away by the wind to new locations. This is known as wind dispersal, and it is a common way that many types of fungi and plants spread their spores or seeds to new areas. Therefore, is the correct answer.

Lisez la note de cours sur Characteristics Of Some Of The Orders Of Class Insecta (WAEC)

Characteristics Of Some Of The Orders Of Class Insecta

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Question 43 Rapport

The most successful group of animals in terms of diversity of species is

mollusca

arthropoda Bonne réponse

mammalia

platyhelminthes

Détails de la réponse

The most successful group of animals in terms of diversity of species is Arthropoda. Arthropods include insects, spiders, crustaceans, and other groups, and they have been able to colonize virtually every habitat on Earth, from deep ocean trenches to mountaintops, and from rainforests to deserts. Arthropods make up more than 80% of all known living animal species, which is an impressive feat and the reason why they are considered the most successful group of animals.

Lisez la note de cours sur Variety Of Organisms (JAMB)

Lisez la note de cours sur Evidence Of Evolution (JAMB)

Variety Of Organisms

Evidence Of Evolution

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Question 44 Rapport

What is the term used to describe the sum total of biotic and abiotic factors in the environment of the organism?

Habitat

Biome

Ecosystem Bonne réponse

Ecological niche

Détails de la réponse

The term used to describe the sum total of biotic and abiotic factors in the environment of the organism is "ecosystem". An ecosystem consists of all the living organisms in a particular area, along with their physical environment, including water, air, soil, and other non-living factors. The ecosystem is a dynamic system in which living organisms interact with each other and their environment. It involves the flow of energy and matter, and the cycling of nutrients among the living and non-living components of the ecosystem.

Lisez la note de cours sur Local (Nigerian) Biomes (JAMB)

Lisez la note de cours sur Relevance Of Biology To Agriculture (WAEC)

Lisez la note de cours sur Ecosystem (WAEC)

Local (Nigerian) Biomes

Relevance Of Biology To Agriculture

Ecosystem

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Question 45 Rapport

Carnivorous plants are usually found in areas

which are deficient of nitrate

which are deficient of oxygen

with low pH

where insects are abundant Bonne réponse

Détails de la réponse

Carnivorous plants are usually found in areas where insects are abundant. This is because these plants have adapted to grow in nutrient-poor soils by evolving the ability to trap and digest insects in order to obtain the necessary nutrients such as nitrogen and phosphorus. Insects are a rich source of these nutrients, and so the presence of an abundance of insects in an area is beneficial for the survival of carnivorous plants.

Lisez la note de cours sur Ecology Of Population (WAEC)

Lisez la note de cours sur Ecosystem (WAEC)

Ecology Of Population

Ecosystem

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Question 46 Rapport

Which path does sound entering the human ear follow?

Oval window → ossicles → ear drum

Ear drum → oval window → ossicles

Ear drum → ossicles → oval window Bonne réponse

Ossicles → ear drum → oval window

Détails de la réponse

The path that sound entering the human ear follows is: ear drum → ossicles → oval window. When sound waves enter the ear, they travel down the ear canal and strike the eardrum, causing it to vibrate. These vibrations are then transmitted through three tiny bones in the middle ear, known as the ossicles, which amplify and transmit the sound to the oval window. The oval window, a membrane-covered opening in the cochlea, then vibrates, which stimulates the fluid inside the cochlea, producing nerve impulses that the brain interprets as sound.

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Lisez la note de cours sur The Cell And Its Environment: Physical And Biophysical Processes (WAEC)

Transport System

Cell Structure

The Cell And Its Environment: Physical And Biophysical Processes

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Question 47 Rapport

Which of the following instruments is NOT used in measuring abiotic factors in any habitat?

Microscopic Bonne réponse

Thermometer

Hygrometer

Wind vane

Détails de la réponse

The instrument that is NOT used in measuring abiotic factors in any habitat is "Microscope". A microscope is an instrument used to observe and magnify small objects that are not visible to the naked eye, but it is not used for measuring abiotic factors such as temperature, humidity, and wind direction, which are physical and chemical factors in the environment. The instruments used for measuring abiotic factors are a thermometer for temperature, a hygrometer for humidity, and a wind vane for wind direction.

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Transport

Simple Measurement Of Ecological Factors

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Question 48 Rapport

When it is cold, the blood vessels of the skin

dilates to increase the amount of blood flowing

constrict to reduced the amount of blood flowing to the skin Bonne réponse

dilate to reduce the amount of blood flowing to the skin

constrict to increase the amount of blood flowing to the skin

Détails de la réponse

When it is cold, the blood vessels of the skin constrict to reduce the amount of blood flowing to the skin. This is a mechanism to conserve heat and maintain the body's internal temperature. When the blood vessels constrict, less blood flows to the skin and more blood is redirected to internal organs, which helps to keep them warm. This is why people may experience a pale, cool skin when exposed to cold temperatures.

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Classification

Respiratory System

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Question 49 Rapport

Manufactured food in the plant is transported through the

xylem

phloem Bonne réponse

cambium

cortex

Détails de la réponse

Manufactured food in the plant is transported through the phloem. Phloem is a specialized tissue in plants responsible for the transportation of nutrients, including the carbohydrates produced by photosynthesis, from the leaves to other parts of the plant where they are needed for growth and energy. This process is called translocation and is powered by the pressure flow mechanism, which involves the active transport of sugars from source to sink tissues. In contrast, the xylem is responsible for transporting water and minerals from the roots to the rest of the plant. The cambium is a tissue responsible for secondary growth, while the cortex is a tissue located in the outermost layer of the stem or root.

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Transport

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Question 50 Rapport

Plants adapted for life in salty marsh are called

hydrophytes

xerophytes

halophytes Bonne réponse

epiphytes

Détails de la réponse

Plants adapted for life in salty marshes are called halophytes. Halophytes are plants that are adapted to grow in soils that have high salt concentrations, such as those found in salt marshes, mangrove swamps, and other coastal areas. They have unique adaptations that allow them to take up and tolerate salt, such as specialized salt glands and the ability to store excess salt in their tissues. These adaptations enable halophytes to survive and thrive in environments where other plants would perish due to the high salt concentrations.

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Factors Affecting The Distribution Of Organisms

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