JAMB UTME - Biology - 2000 | Green Bridge CBT

Question 1 Report

A characteristic of vertebrates that is unique to mammals is

the presence of pentadctyl limbs

parental care

the possession of scrotum

pulmonary circulation

Answer Details

Read lesson note on Growth (JAMB)

Growth

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Question 2 Report

The disaster that would have the least destructive impact on animal life and balance in nature is

chemical pollution

forest fires

oil spillage

grasshopper pests

Answer Details

Out of the options given, grasshopper pests would have the least destructive impact on animal life and balance in nature. While grasshopper pests can cause damage to crops and vegetation, they do not have as significant an impact on the overall ecosystem as the other options. Chemical pollution, forest fires, and oil spillage can all have devastating effects on the environment, including the loss of habitat, destruction of food sources, and the deaths of many animals. Chemical pollution can cause long-term damage to soil and water, leading to the death of plants and animals. Forest fires can destroy large areas of habitat, leading to the displacement or death of many animals, and it can take years for the ecosystem to fully recover. Oil spillage can lead to the death of marine life and the contamination of habitats, affecting the entire food chain. In contrast, grasshopper pests, while problematic for agriculture, are a natural part of the ecosystem and can actually be beneficial in some cases. They serve as a food source for many predators, and their consumption of vegetation can stimulate plant growth and diversity. Therefore, based on the information provided, grasshopper pests would have the least destructive impact on animal life and balance in nature compared to the other options.

Read lesson note on Ecosystem (WAEC)

Ecosystem

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Question 3 Report

The greatest amount of energy will be obtained by the oxidation of 100kg of

meat

butter

sugar

biscuits

Answer Details

Read lesson note on Ecological Management: Tolerance, Minimum And Maximum (WAEC)

Ecological Management: Tolerance, Minimum And Maximum

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Question 4 Report

Short-sightedness can be corrected by lenses which are

convex

biconvex

plano-convex

concave

Answer Details

Short-sightedness, also known as myopia, occurs when the eye is too long or the cornea is too curved, causing distant objects to appear blurry. To correct this, a lens with a negative or concave curvature is needed to diverge the light before it enters the eye, allowing distant objects to be seen clearly. Therefore, the correct option is a concave lens.

Read lesson note on Sense Organs (Nose, Tongue & Skin) (WAEC)

Sense Organs (Nose, Tongue & Skin)

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Question 5 Report

Th order in which organic evolution has progressed in plants is

thallophyta, schizophyta, bryophyta, pteridophyta and spermatophyta

schizophyta, thallophyta, bryophyta, pteridophyta and spermatophyta

pteridophyta, spermatophyta, thallophyta, schizophyta and bryophyta

bryophyta, pteridophyta, spermatphyta, thallophyta and schizophyta

Answer Details

Read lesson note on Evolution (Theories and Evidence) (WAEC)

Evolution (Theories and Evidence)

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Question 6 Report

The pollutants that contribute to the depletion of the ozone layer in the atmosphere are

radioactive materials

oxides of sulphur

oxides of carbon

chlorofluorocarbons

Answer Details

The pollutants that contribute to the depletion of the ozone layer in the atmosphere are chlorofluorocarbons (CFCs). CFCs are synthetic organic compounds containing chlorine, fluorine, and carbon. They are used as refrigerants, propellants in aerosol cans, and in the production of foam products. When CFCs are released into the atmosphere, they rise to the stratosphere and are broken down by ultraviolet radiation, releasing chlorine atoms. These chlorine atoms then react with ozone molecules, breaking them down and depleting the ozone layer.

Read lesson note on Nutrient Cycling In Nature (WAEC)

Nutrient Cycling In Nature

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Question 7 Report

The scapula and the ischium are part of the

pectoral girdle

pelvic girdle

appendicular skeleton

hind limb

Answer Details

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Question 8 Report

The chamber of the mammalian heart with the thickest wall is the

right ventricles

left auricle

right auricle

left ventricle

Answer Details

The chamber of the mammalian heart with the thickest wall is the left ventricle. This is because the left ventricle is responsible for pumping oxygen-rich blood to the rest of the body, so it needs to generate more forceful contractions than the other chambers. The thick wall of the left ventricle is made up of strong muscle tissue that allows it to contract with enough force to push blood through the systemic circulation, which is the circulation of blood throughout the body. The right ventricle, on the other hand, has a thinner wall because it only needs to pump blood to the lungs, which are nearby and don't require as much force.

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Question 9 Report

The part of the brain that controls body posture in mammals is the

thalamus

cerebellum

spinal cord

cerebrum

Answer Details

The part of the brain that controls body posture in mammals is the cerebellum. The cerebellum is a part of the brain located at the base of the skull, underneath the cerebrum. It is responsible for coordinating movements and maintaining balance and posture. It receives information from the sensory systems in the body, as well as from other parts of the brain, and uses this information to regulate muscle activity and adjust body posture. When the cerebellum is damaged or not functioning properly, a person may experience difficulty with coordination, balance, and maintaining posture. This can lead to problems with movement, such as tremors, unsteadiness, and difficulty walking. Therefore, the cerebellum is the part of the brain that plays a key role in controlling body posture in mammals.

Read lesson note on Excretory System (WAEC)

Read lesson note on Animal Nutrition (WAEC)

Read lesson note on Nervous Coordination (WAEC)

Excretory System

Animal Nutrition

Nervous Coordination

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Question 10 Report

The factors that determine the distribution of vegetation zones are

temperature, light, rain and humidity

light, humidity, air and mist

temperature, light, air and humidity

humidity, snow, frost and dew

Answer Details

The distribution of vegetation zones is determined by temperature, light, rain, and humidity. Temperature affects the type of vegetation that can grow in a particular area; areas with colder temperatures usually have different vegetation than areas with warmer temperatures. Light also affects vegetation distribution; areas with more sunlight tend to have different vegetation than areas with less sunlight. Rain and humidity affect the availability of water for plant growth, which can determine the types of vegetation that can thrive in an area. Areas with more rain and humidity tend to have different vegetation than areas with less rain and humidity. Overall, these four factors interact to determine the distribution of vegetation zones around the world.

Read lesson note on Factors Affecting The Distribution Of Organisms (JAMB)

Read lesson note on Natural Habitats (JAMB)

Factors Affecting The Distribution Of Organisms

Natural Habitats

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Question 11 Report

Which of the following structural features are adapted for uses other than water conservation?

Succulent stems

Scales in animals

Spines in plants

Feathers in birds

Answer Details

Feathers in birds are structural features that are adapted for uses other than water conservation. While feathers do provide some insulation and protection against water, their main function is for flight and display. Feathers are highly specialized structures that have evolved to provide lift and allow birds to fly through the air. They are also used for mating displays, camouflage, and communication. Succulent stems, scales in animals, and spines in plants are all adaptations for water conservation. Succulent stems store water, scales in animals reduce water loss by covering the skin, and spines in plants reduce water loss by protecting against herbivory. Therefore, feathers in birds are the structural features in the given options that are adapted for uses other than water conservation.

Read lesson note on Structural Adaptation For Survival (WAEC)

Structural Adaptation For Survival

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Question 12 Report

In a food chain, each succeeding level in a forward direction represents

an increase in the number of individuals

a decrease in the number of individuals

an increase in the biomass of individuals

a gain in the total energy being transferred

Answer Details

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Question 13 Report

The surest way to combine the best qualities of both parents in the offspring is by

cross-breeding

inbreeding

selective breeding

pure breeding

Answer Details

Read lesson note on Probability In Genetics (Hybrid Formation) (WAEC)

Read lesson note on Behavioural Adaptations In Social Animals (WAEC)

Read lesson note on Application Of The Principles Of Heredity (WAEC)

Read lesson note on Heredity (JAMB)

Probability In Genetics (Hybrid Formation)

Behavioural Adaptations In Social Animals

Application Of The Principles Of Heredity

Heredity

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Question 14 Report

An ecological succcession often leads to

an increase in species diversity

decrease in species diversity

an unstable community

the dispersal of species

Answer Details

Ecological succession refers to the gradual and predictable process of change in the composition of species in an ecosystem over time. In general, ecological succession tends to lead to an increase in species diversity, meaning that more and more different types of organisms become established and thrive within the ecosystem. This is because ecological succession typically begins with the colonization of the area by a relatively small number of pioneering species that are well-suited to the harsh conditions of the newly-formed or disturbed environment. Over time, these species modify the environment in ways that make it more hospitable to other, less hardy species, which then begin to colonize the area as well. As this process continues, the number and variety of species within the ecosystem tends to increase, leading to greater overall diversity. Of course, there are many factors that can influence the course and outcome of ecological succession, and not all successions will result in the same patterns of species diversity. However, in general, an increase in species diversity is one of the most common and noticeable outcomes of ecological succession.

Read lesson note on Classification (WAEC)

Read lesson note on Ecosystem (WAEC)

Classification

Ecosystem

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Question 15 Report

The gas occupying the space labelled I is

carbon (IV) oxide

nitrogen

hydrogen

oxygen

Answer Details

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Question 16 Report

Atmospheric nitrogen is converted to soil nitrogen for plant use by

nitrification and combustion

putrefaction and lightning

lightning and nitrification

combustion and putrefaction

Answer Details

Read lesson note on Nitrogen Cycle (WAEC)

Nitrogen Cycle

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Question 17 Report

In mammals, reabsorption of salt takes place in

III

Answer Details

Read lesson note on Animal Nutrition (WAEC)

Read lesson note on Ways Of Ensuring Conservation (WAEC)

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

Read lesson note on Respiratory System (WAEC)

Animal Nutrition

Ways Of Ensuring Conservation

Excretory Systems And Mechanisms; Types Of Excretory Systems

Respiratory System

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Question 18 Report

The part labelled II is the

silk thread

thorax

fore wing

anchor

Answer Details

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Question 19 Report

Which of the following is an adaptation of tropical rainforest species?

Few stomata

Thick bark

Buttress roots

Reduced leaves

Answer Details

The adaptation of buttress roots is typical of tropical rainforest species. Buttress roots are large, flat roots that extend from the base of the trunk and provide additional support to the tree. They are a common adaptation in tropical rainforests, where trees must be able to support themselves in shallow soils with high rainfall and wind. The large surface area of buttress roots also helps to absorb nutrients from the thin topsoil found in these environments. Few stomata is an adaptation found in desert plants that helps reduce water loss. Thick bark is an adaptation found in trees in dry, cold, or fire-prone environments that provides protection from the elements. Reduced leaves is an adaptation found in plants in arid environments that helps reduce water loss through transpiration. Therefore, buttress roots are the adaptation of tropical rainforest species that help them thrive in their unique environment.

Read lesson note on Natural Habitats (JAMB)

Natural Habitats

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Question 20 Report

In a group of male Agama lizards, the one with the brightest head colour is the

dominant

youngest

oldest

largest

Answer Details

The male Agama lizard with the brightest head color is typically the dominant one in the group. This means that it has the highest rank and most control over resources and mating opportunities within the group. Other males may exhibit less bright head colors and defer to the dominant male, allowing it to maintain its status as the leader of the group. Therefore, the brightness of the head color is an important visual signal used in social communication and hierarchy establishment among male Agama lizards.

Read lesson note on Ecological Components (WAEC)

Ecological Components

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Question 21 Report

Complex social behaviour and organization are found mostly in

insects

birds

reptiles

mammals

Answer Details

Complex social behavior and organization are mostly found in mammals. Mammals are warm-blooded animals that have fur or hair, and most of them give birth to live young. Many mammals, such as primates, elephants, whales, dolphins, and some rodents, live in complex social groups and have well-defined social structures. They exhibit behaviors such as cooperation, communication, and division of labor, which are important for their survival and reproduction. In contrast, while some insects, birds, and reptiles also display social behavior, it is generally less complex than that found in mammals.

Read lesson note on Behavioural Adaptations In Social Animals (WAEC)

Read lesson note on Growth (JAMB)

Behavioural Adaptations In Social Animals

Growth

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Question 22 Report

For growth to occur in organisms, the rate of

food storage must be low

catabolism must exceed that of anabolism

anabolism must exceed that of catabolism

food storage must be high

Answer Details

For growth to occur in organisms, the rate of anabolism must exceed that of catabolism. Anabolism is the process of building complex molecules from simpler ones, while catabolism is the breakdown of complex molecules into simpler ones. In order for an organism to grow, it needs to produce more complex molecules (such as proteins and DNA) than it breaks down. This requires a net energy input, which is obtained from food. Therefore, food storage must be high enough to provide the necessary energy and building blocks for anabolism, but it is not the determining factor for growth.

Read lesson note on Growth (JAMB)

Growth

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Question 23 Report

Which of the following are adaptations of animals to aquatic habitats?

Gills, streamlined bodies and lateral lines

Lateral line, streamlined bodies and lungs

Gills, scaly skin and lungs

Gills, streamlined bodies and spiracles

Answer Details

The adaptation of animals to aquatic habitats are characteristics or features that help them survive and thrive in water. Out of the options listed, the adaptation of animals to aquatic habitats includes "Gills, streamlined bodies and lateral lines." Gills are used by aquatic animals to extract oxygen from the water. Streamlined bodies reduce drag and make it easier to swim through the water, while lateral lines help animals sense movement and vibrations in the water. These adaptations are particularly useful for fish, which are the primary group of animals that have these characteristics. The other options may be adaptations of animals to other environments, but they are not specific to aquatic habitats. For example, lungs are an adaptation to life on land, while scaly skin is an adaptation to life in arid environments. Spiracles are openings on the bodies of insects that are used for breathing, but they are not adaptations to aquatic environments.

Read lesson note on Co-ordination And Control (JAMB)

Read lesson note on Support And Movement (JAMB)

Read lesson note on Cell Structure (WAEC)

Co-ordination And Control

Support And Movement

Cell Structure

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Question 24 Report

The set of fins that control steering, balancing and change of direction and pitch in fish is

dorsal and anal

pectoral and pelvics

caudal and dorsal

anal and pelvics

Answer Details

The set of fins that control steering, balancing, and changing direction and pitch in fish is the pectoral and pelvic fins. These fins are located on the sides of the fish and are responsible for controlling the fish's movement and direction in the water. The dorsal and anal fins are primarily used for stability and propulsion, while the caudal fin (tail fin) is used for propulsion and speed. However, the pectoral and pelvic fins play a crucial role in the fish's ability to turn and maneuver through the water.

Read lesson note on Animal Nutrition (WAEC)

Animal Nutrition

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Question 25 Report

The soil becomes toxic to plants when the concentration of its essential elements is in the range labelled

III

Answer Details

The soil becomes toxic to plants when the concentration of its essential elements is in the range labelled IV. In soil, there is an optimal concentration range of essential elements that supports plant growth and development. When the concentration of essential elements exceeds the optimal range, it can become toxic to plants and adversely affect their growth and survival. The range labelled IV refers to the concentration range where the essential elements become excessively high, resulting in toxicity for plants. Therefore, it is important to maintain the optimal range of essential elements in the soil for healthy plant growth.

Read lesson note on Soil (JAMB)

Read lesson note on Soil (WAEC)

Soil

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Question 26 Report

The mutation theory of organic evolution was propounded by

Gregor Mendel

Hugo de Vries

Jean Lamarck

Charles Darwin

Answer Details

The mutation theory of organic evolution was propounded by Hugo de Vries. Hugo de Vries was a Dutch botanist who lived from 1848 to 1935. He was one of the first scientists to study the genetics of plants and proposed the mutation theory of organic evolution in the early 1900s. The mutation theory states that new species arise from sudden, heritable changes in the genetic material (mutations) that occur spontaneously rather than through gradual accumulation of small changes as proposed by Charles Darwin's theory of natural selection. De Vries believed that these mutations were responsible for the sudden appearance of new species in the fossil record and that they could occur rapidly and independently of natural selection. He conducted experiments on plant breeding and found evidence to support his theory. Although the mutation theory was initially met with skepticism, it has since become an important aspect of modern evolutionary theory. Today, we know that mutations do play a role in the origin of new species, and scientists continue to study the mechanisms of mutation and their effects on evolution.

Read lesson note on Evolution (Theories and Evidence) (WAEC)

Evolution (Theories and Evidence)

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Question 27 Report

The inner ear contains two main organs, namely, the

eardrum and eustachian tube

cochlea and semi-circular canals

oval window and ossicles

pinna and cochlea

Answer Details

The inner ear contains two main organs, the cochlea and the semi-circular canals. The cochlea is responsible for hearing, and it contains hair cells that respond to sound vibrations and transmit them to the brain. The semi-circular canals are responsible for balance and detecting head movements. They are three fluid-filled canals that are oriented in different planes, and when the head moves, the fluid inside the canals moves, which stimulates hair cells that send signals to the brain. Therefore, the cochlea and semi-circular canals are the two main organs of the inner ear that are responsible for hearing and balance.

Read lesson note on Sense Organs (Nose, Tongue & Skin) (WAEC)

Sense Organs (Nose, Tongue & Skin)

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Question 28 Report

Which of the following features are all associated with monocots?

Fibrous root system, branched network of veins and one seed leaf

Fibrous root system, two seed leaves and floral parts in threes

One seed leaf, petals in threes or group of thees and parallel venation of leaves

One seed leaf, net-veined leaves and petals in threes or multiple of three

Answer Details

The feature associated with monocots is: one seed leaf, parallel venation of leaves, and petals in threes or a multiple of three. Monocots and dicots are two major classes of flowering plants. Monocots have one seed leaf, while dicots have two. Monocots also have parallel venation of leaves, meaning the veins run parallel to each other, while dicots have net-veined leaves. Additionally, the flowers of monocots have petals in threes or a multiple of three, while in dicots, the floral parts are in fours or fives. Therefore, the features of one seed leaf, parallel venation of leaves, and petals in threes or a multiple of three are all associated with monocots.

Read lesson note on Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Morphology Of Monocotyledonous And Dicotyledonous Plants

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Question 29 Report

In which part of the human body does the secretion of the growth hormone occur?

Head region

Waist region

Neck region

Gonads

Answer Details

The secretion of the growth hormone occurs in the head region of the human body. More specifically, the growth hormone is produced and secreted by the pituitary gland, which is located at the base of the brain in the head region. The pituitary gland is a small gland that plays a major role in regulating various bodily functions, including growth, metabolism, and reproduction. The growth hormone is essential for proper growth and development in children, and also plays a role in maintaining healthy body composition and metabolism in adults. It stimulates the production of insulin-like growth factor-1 (IGF-1) in the liver, which is responsible for promoting the growth and replication of cells throughout the body. While the growth hormone is primarily produced and secreted in the head region, its effects are felt throughout the body, including in the waist, neck, and gonads.

Read lesson note on Growth (JAMB)

Growth

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Question 30 Report

The production of violet colouration, when dilute NaOH solution is added to a solution of food substance, followed by drops of 1% CuSO4 solution while shaking, indicates the presence of

protein

carbohydrates

fats

reducing

Answer Details

Read lesson note on Modes Of Nutrition (WAEC)

Read lesson note on Nutrition (JAMB)

Read lesson note on Reproduction (JAMB)

Read lesson note on Nucleic Acids (WAEC)

Modes Of Nutrition

Nutrition

Reproduction

Nucleic Acids

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Question 31 Report

The substance labelled II originates from

III only

IV only

I and IV

III and Iv

Answer Details

Read lesson note on Cellular Respiration (WAEC)

Read lesson note on Nucleic Acids (WAEC)

Cellular Respiration

Nucleic Acids

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Question 32 Report

A cross between an albino female and a genetically normal male will result in offspring that are

all albino

all phenotypically normal

all genetically normal

half albino and half normal

Answer Details

A cross between an albino female and a genetically normal male will result in offspring that are all phenotypically normal, but all of them will be carriers of the albino gene. Albinism is a genetic condition that is inherited in an autosomal recessive manner, which means that an individual must inherit two copies of the gene to express the albino phenotype. The albino female has two copies of the albino gene, while the genetically normal male has two copies of the normal gene. During fertilization, each parent contributes one copy of their genes to their offspring. Therefore, all the offspring will receive one copy of the normal gene from the father and one copy of the albino gene from the mother, making them carriers of the albino gene. However, since they only have one copy of the albino gene, they will not express the albino phenotype and will be phenotypically normal. If two of these carriers mate, they will have a 25% chance of producing albino offspring.

Read lesson note on Application Of The Principles Of Heredity (WAEC)

Read lesson note on Heredity (JAMB)

Application Of The Principles Of Heredity

Heredity

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Question 33 Report

In an experiment to estimate the volume of air in a soil sample using a measuring cylinder, it was found that:

Initial volume of water .... = p cm3

Volume of soil before mixing with water = q cm3

Final volume of water after adding soil = r cm3

From the data above, which of the following deductions is correct?

r = p + q

r > p + q

q = r - p

r< p + q

Answer Details

Read lesson note on Animal Nutrition (WAEC)

Read lesson note on Plant Nutrition (WAEC)

Animal Nutrition

Plant Nutrition

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Question 34 Report

The most recently evolved structure in animals is the

hair

cilium

scale

feather

Answer Details

Read lesson note on Theories Of Evolution (JAMB)

Theories Of Evolution

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Question 35 Report

Peripherals arrangement of vascular tissues in dicots is a characteristic of the internal structure of the

leaf

petiole

stem

root

Answer Details

Peripheral arrangement of vascular tissues in dicots is a characteristic of the internal structure of the stem. In dicot stems, vascular bundles (collections of xylem and phloem tissues) are arranged in a circular pattern around the edge of the stem, forming a ring. This arrangement is known as a peripheral vascular arrangement and is characteristic of dicot stems. The peripheral arrangement of vascular tissues helps to provide structural support to the stem and allows for efficient transport of water, minerals, and nutrients throughout the plant. Therefore, the peripheral arrangement of vascular tissues is a feature of the internal structure of the stem in dicots.

Read lesson note on Nutrition (JAMB)

Nutrition

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Question 36 Report

The parts labelled I and II make up the

glomerulus

convoluted tubules

Malpighian body

Bowman's capsule

Answer Details

The parts labelled I and II make up the Malpighian body. The Malpighian body is a structure found in the kidney that is responsible for filtering blood and forming urine. It is made up of two main parts: the glomerulus and Bowman's capsule. The glomerulus is a small network of blood vessels that allows for the filtration of blood. It is located within Bowman's capsule, which is a cup-shaped structure that surrounds the glomerulus and collects the filtered blood and other fluids. Together, the glomerulus and Bowman's capsule make up the Malpighian body, which is the functional unit of the kidney responsible for filtration and urine formation.

Read lesson note on Cell Structure (WAEC)

Cell Structure

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Question 37 Report

The part labelled II is the

mesocarp

pericarp

endocarp

epicarp

Answer Details

Read lesson note on Sense Organs (Nose, Tongue & Skin) (WAEC)

Read lesson note on Soil (WAEC)

Sense Organs (Nose, Tongue & Skin)

Soil

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Question 38 Report

A certain savanna grasshopper changes colour from green during the rainy season to brown during the dry season and black after dry season bush fires. The reason for these colour changes is that the

grasshopper is getting older

environmental temperature is changing

grasshopper is avoiding predation

grasshopper is frequently moulting

Answer Details

The reason for the colour changes in a certain savanna grasshopper is that it is adapting to changes in its environment and avoiding predation. During the rainy season, the grass is green and lush, and the grasshopper's green colouration helps it blend in with its surroundings and avoid being spotted by predators. In the dry season, the grass dries up and turns brown, and the grasshopper changes to a brown colour to blend in with its new surroundings. After dry season bush fires, the grass is burned, and the grasshopper changes to a black colour to blend in with the burnt surroundings. This helps it avoid being seen by predators that might be searching for prey in the burnt area. Therefore, the reason for the colour changes in this savanna grasshopper is that it is adapting to changes in its environment and avoiding predation. By changing its colour to match its surroundings, the grasshopper is better able to hide from predators and increase its chances of survival.

Read lesson note on Behavioural Adaptations In Social Animals (WAEC)

Read lesson note on Adaptive Colouration (WAEC)

Read lesson note on Cell Structure (WAEC)

Behavioural Adaptations In Social Animals

Adaptive Colouration

Cell Structure

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Question 39 Report

The part that will develop into an organ for feeling is labelled

III

Answer Details

Read lesson note on Sense Organs (Eyes & Ears) (WAEC)

Sense Organs (Eyes & Ears)

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Question 40 Report

The range at which soil essential elements concentration is recorded for optimal plant growth is marked

III

Answer Details

Read lesson note on Soil (JAMB)

Read lesson note on Soil (WAEC)

Soil

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Question 41 Report

The older fossil-bearing rocks, in contrast to the more recent ones, are more likely to contain

animal rather than plant remains

invertebrates rather than birds

flowering plants rather than mosses

reptiles rather than fishes

Answer Details

Read lesson note on Animal Nutrition (WAEC)

Read lesson note on Mosses And Ferns (WAEC)

Read lesson note on Evolution (Theories and Evidence) (WAEC)

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

Animal Nutrition

Mosses And Ferns

Evolution (Theories and Evidence)

Amoeba, Paramecium, And Euglena

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Question 42 Report

The legs and beak of an egret resemble those of the heron because they

both feed on fishes

are both birds

occupy similar niche

occupy the same trophic level

Answer Details

Read lesson note on Food Webs And Trophic Levels (WAEC)

Read lesson note on Cell Structure (WAEC)

Food Webs And Trophic Levels

Cell Structure

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Question 43 Report

Example of water-borne and sex linked diseases are

taeniasis and malaria

cholera and gonorrhoea

typhoid and syphilis

dracunculiasis and haemophilia

Answer Details

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

Read lesson note on Linkage, Sex Determination And Sex Linked Characters (WAEC)

Excretory Systems And Mechanisms; Types Of Excretory Systems

Linkage, Sex Determination And Sex Linked Characters

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Question 44 Report

Coelom is absent in the class of animals termed

mollusca

reptilia

arthropoda

coelenterata

Answer Details

Coelom is absent in the class of animals termed coelenterata, also known as cnidarians. Cnidarians are a diverse group of aquatic animals that include jellyfish, corals, and sea anemones. They have a simple body plan with two cell layers, an outer epidermis and an inner gastrodermis, separated by a jelly-like layer called mesoglea. They do not have a true body cavity or coelom. Instead, their digestive and reproductive organs are suspended in the gastrovascular cavity, which functions both for digestion and distribution of nutrients throughout the body. This cavity is lined by gastrodermis, which performs both digestive and absorptive functions. In contrast, the other animal groups listed, Mollusca, Reptilia, and Arthropoda, all have a true coelom, which is a fluid-filled body cavity completely lined by mesoderm, the middle layer of cells in the embryo. This coelom allows for more complex body structures and organ systems to develop, and also serves as a space for circulation of fluids and other substances in the body.

Read lesson note on Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

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Question 45 Report

Serum differs from blood plasma because

contains blood cells and fibrinogen

contains soluble food and mineral salt

lacks the blood protein and fibrinogen

lacks blood cells and albumin

Answer Details

Serum differs from blood plasma because it lacks the blood protein fibrinogen. Both serum and blood plasma are components of blood that are obtained when blood is separated by centrifugation. However, plasma contains all the proteins normally found in blood, including fibrinogen, while serum is the fluid that remains after the blood has clotted and the fibrinogen has been removed. Therefore, while blood plasma contains fibrinogen and other blood proteins, serum lacks fibrinogen, which is why it is often used for diagnostic tests that require the measurement of blood clotting ability. Serum also lacks blood cells, but this is true of both serum and plasma, as these are removed during the centrifugation process.

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

The fruit represented is mainly dispersed by

animals

water

wind

birds

Answer Details

Read lesson note on Classification (WAEC)

Read lesson note on Adaptive Colouration (WAEC)

Read lesson note on Ecosystem (WAEC)

Classification

Adaptive Colouration

Ecosystem

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Question 47 Report

Which of the following growth activities in plants is brought about by gibberellins?

Rapid cell division

Tropic response

Cell elongation

Main cell elongation

Answer Details

Gibberellins are plant hormones that play an important role in regulating growth and development. One of the growth activities in plants that is brought about by gibberellins is cell elongation. Gibberellins stimulate the elongation of cells in the stem and leaves, leading to an increase in plant height and leaf size. This is important for plant growth and development, as it allows the plant to reach for sunlight and compete with other plants for resources. While gibberellins do not directly cause rapid cell division or tropic response, they can indirectly influence these processes through their effects on cell elongation and other aspects of plant growth. Therefore, the correct answer to the question is "cell elongation."

Read lesson note on Nutrition (JAMB)

Nutrition

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Question 48 Report

Blood grouping in human beings is derived from combinations of

two different alleles

four different alleles

three different alleles

two different genes

Answer Details

All humans and many other primates can be typed for the ABO blood group. There are four principal types: A, B, AB, and O. There are two antigens and two antibodies that are mostly responsible for the ABO types. The specific combination of these four components determines an individual's type in most cases

Read lesson note on Support And Movement (JAMB)

Support And Movement

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Question 49 Report

I. High birth rate and high immigration rate II. Low birth rate and high immigration rate II. Low mortality rate and low emigration IV. High mortality rate and high emigration rate. Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?

II and III

I and III

I and IV

I and II

Answer Details

Read lesson note on Variation In Population (JAMB)

Read lesson note on Co-ordination And Control (JAMB)

Variation In Population

Co-ordination And Control

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Question 50 Report

Bacteria in the large intestine of man are important in the

synthesis of vitamins K and B2

digestion of vegetables

synthesis of vitamins A and D

absorption of water

Answer Details

Bacteria in the large intestine of humans are important in the synthesis of vitamins K and B2. The large intestine, also known as the colon, is the final part of the digestive system. It is home to trillions of bacteria, collectively known as the gut microbiota. These bacteria perform a number of important functions in the body, including aiding in digestion, modulating the immune system, and synthesizing vitamins. One of the most important roles of gut bacteria is the synthesis of vitamins K and B2. Vitamin K is essential for blood clotting and bone health, while vitamin B2, also known as riboflavin, is important for energy production and maintaining healthy skin, eyes, and nervous system. While humans cannot synthesize these vitamins on their own, certain bacteria in the large intestine have the ability to produce them. These bacteria break down undigested food particles and produce the vitamins as byproducts, which can then be absorbed by the body. Therefore, bacteria in the large intestine of humans play an important role in the synthesis of vitamins K and B2, which are essential for various bodily functions.

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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