JAMB UTME - Biology - 2005 | Green Bridge CBT

Question 1 Report

The Mambila plateau is a unique Nigerian biome located in

Plateau state

Borno state

Taraba state Correct answer

Benue state

Answer Details

The Mambila plateau is a unique Nigerian biome located in Taraba state.

Read lesson note on Local (Nigerian) Biomes (JAMB)

Local (Nigerian) Biomes

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Question 2 Report

The organelle common to both plant and animal cells is the

centrioles

plasmalemma Correct answer

cell wall

chloroplast

Answer Details

Read lesson note on Cell Structure (WAEC)

Cell Structure

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Question 3 Report

The only vein that carriers pure oxygenated blood is the

renal vein

pulmonary vein Correct answer

hepatic vein

sciatic vein

Answer Details

The vein that carries pure oxygenated blood is the pulmonary vein. The pulmonary vein is the only vein in the body that carries oxygenated blood from the lungs to the heart. The other veins in the body carry deoxygenated blood back to the heart. The renal vein carries blood from the kidney to the heart, the hepatic vein carries blood from the liver to the heart, and the sciatic vein does not exist (there is a sciatic nerve, but no sciatic vein).

Read lesson note on Transport System (WAEC)

Read lesson note on Ecosystem (WAEC)

Transport System

Ecosystem

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Question 4 Report

From the diagram above, the structure labelled I is the

incus

malleus

hammer

stapes Correct answer

Answer Details

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Question 5 Report

The main reservoir of water in the circle is the

cloud

ground water

plant

ocean Correct answer

Answer Details

From the question, it seems to be referring to the water cycle, where water moves through various stages, including evaporation, condensation, precipitation, and storage in different reservoirs. The question is asking about the main reservoir of water in this cycle. Out of the options given, the ocean is the largest and most significant reservoir of water in the water cycle. It holds about 97% of the Earth's water, making it the most significant water body on the planet. It plays a crucial role in the water cycle, as it's the primary source of water for the cycle. Water from the ocean evaporates, forming water vapor that rises into the atmosphere, and then it returns to the earth as precipitation, completing the water cycle. Therefore, the correct answer to the question is "ocean."

Read lesson note on Ecosystem (WAEC)

Ecosystem

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Question 6 Report

When bacteria swim from cold to warm regions this is known as

negative chemotaxis

positive thermotaxis Correct answer

positive phototaxis

negative phototaxis

Answer Details

Bacteria swimming from cold to warm regions is known as positive thermotaxis. This means that the bacteria are attracted to warmer temperatures and will move towards them. Bacteria use different types of taxis, such as chemotaxis and phototaxis, to move towards or away from different stimuli in their environment. In this case, the warm temperature acts as a stimulus that the bacteria are moving towards, which is why it is called positive thermotaxis.

Read lesson note on Classification (WAEC)

Classification

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Question 7 Report

The main function of the caudal fin in Tilapia is to

propel it forward in water Correct answer

steer it while changing direction

balance it in water

enable it to float in water

Answer Details

The main function of the caudal fin in Tilapia is to propel it forward in water. The caudal fin is the tail fin of a fish, and it is responsible for generating the propulsion that moves the fish through water. In Tilapia, the caudal fin is particularly large and powerful, which allows the fish to swim efficiently and maneuver through its aquatic environment. The other fins, such as the pectoral and dorsal fins, help to control the direction of movement and maintain balance, but it is the caudal fin that provides the primary means of propulsion for Tilapia.

Read lesson note on Adaptation For Survival (WAEC)

Read lesson note on Support And Movement (JAMB)

Adaptation For Survival

Support And Movement

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Question 8 Report

From the diagram above, The bile is stored in the part labelled

II Correct answer

III

Answer Details

The bile is stored in the part labelled II. The diagram is showing the human digestive system and the part labelled II is the gallbladder. The gallbladder stores and releases bile, which is a digestive fluid produced by the liver. When food reaches the small intestine, the gallbladder contracts and releases bile into the small intestine to aid in the digestion of fats.

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Question 9 Report

Which of the following is used to test for the presence of lime in a soil sample?

H2SO4(aq)

NaOH(aq)

HCl(aq) Correct answer

HNO3(aq)

Answer Details

The correct answer is HCl(aq). When HCl(aq) is added to a soil sample containing lime, a reaction occurs that produces carbon dioxide gas. The presence of carbon dioxide gas indicates the presence of lime in the soil sample. Therefore, HCl(aq) is used to test for the presence of lime in a soil sample.

Read lesson note on Soil (WAEC)

Soil

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Question 10 Report

The association in which one member benefits and the other is relatively unaffected by the interaction is termed

symbiosis

parasitism

commensalism Correct answer

mutualism

Answer Details

When two organisms interact, and one benefits from the interaction while the other is not affected in either a positive or negative way, this type of association is called commensalism. In other words, one organism is "commensal" with the other, meaning that it is sharing the same space and resources without causing harm or benefit to the other organism. An example of commensalism is when a bird builds its nest on a tree, which doesn't harm the tree, but the bird benefits by having a place to raise its young.

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

Symbiotic Interactions Of Plants And Animals

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Question 11 Report

From the diagram above the optimal temperature for breeding cockroaches is

15oC

19oC

24oC Correct answer

33oC

Answer Details

Read lesson note on Habitats (WAEC)

Habitats

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Question 12 Report

The mammalian lung is made air tight by the

pleural cavity

mucous membrane

pleural membrane Correct answer

diaphragm

Answer Details

The mammalian lung is made air tight by the pleural membrane. The pleural membrane is a thin, double-layered membrane that covers the lungs and lines the inside of the chest cavity. It creates a sealed, air-tight space around the lungs called the pleural cavity, which helps to maintain the pressure gradient necessary for breathing. The pleural membrane also produces a lubricating fluid that reduces friction and allows the lungs to expand and contract smoothly during breathing. Therefore, it is the pleural membrane that makes the mammalian lung air tight.

Read lesson note on Respiratory System (WAEC)

Respiratory System

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Question 13 Report

In Nigeria, the guinea savanna belt borders the

mangrove swamps and the sahel savanna

rainforests and the sudan savanna Correct answer

desert and the sudan savanna

rainforests and the deserts

Answer Details

Read lesson note on Local (Nigerian) Biomes (JAMB)

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

Local (Nigerian) Biomes

Factors Affecting The Distribution Of Organisms

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Question 14 Report

A test tube containing yeast in glucose solution containing alkaline pyrogallol. The bubbles of carbon (IV) oxide produced indicates that the yeast cells are

respiring in the absence of oxygen Correct answer

liberating oxygen on their own

living and consuming oxygen

being killed by the alcohol produced

Answer Details

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Question 15 Report

When a peacock displays its colourful feathers, it is

ready for a fight

protecting itself from predators

protecting its mate from predators

courting a female Correct answer

Answer Details

When a peacock displays its colourful feathers, it is courting a female. The elaborate display of feathers is a mating ritual that serves to attract the attention of female peahens. The peacock will fan out his feathers and perform a dance while making a loud calling sound. The brighter and more vibrant the feathers, the more attractive the peacock is to the female. The display of feathers is a way for the peacock to demonstrate his fitness as a mate and to compete with other males for the attention of the females.

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

Behavioural Adaptations In Social Animals

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Question 16 Report

The part of the plant where photosynthesis is least likely to take place is

III

IV Correct answer

Answer Details

Read lesson note on Regulation Of Internal Environment (WAEC)

Regulation Of Internal Environment

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Question 17 Report

Excess water in plants is excreted as water vapour and droplets respectively through

respiration and guttation

transpiration and guttation Correct answer

photosynthesis and guttation

guttation and condensation

Answer Details

Excess water in plants is removed through a process called transpiration, where water vapour is released through tiny pores called stomata on the leaves. In some plants, excess water can also be removed through guttation, where droplets of water are excreted through special structures called hydathodes. Therefore, the correct answer is "transpiration and guttation".

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Question 18 Report

The hyphal wall of fungi is rigid owing to the

cell wall

lignin

cellulose

chitin Correct answer

Answer Details

The hyphal wall of fungi is rigid owing to the presence of chitin. Chitin is a tough, protective, and semi-transparent polysaccharide that makes up the exoskeletons of insects and crustaceans, as well as the cell walls of fungi. It is made up of long chains of a modified sugar called N-acetylglucosamine, which form a tough, fibrous structure that provides support and protection to the fungal cell. The presence of chitin in the hyphal wall gives it its characteristic rigidity.

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Question 19 Report

An example of radially symmetric organism is

planera

Hydra Correct answer

tape worm

round worm

Answer Details

An example of a radially symmetric organism is Hydra. Radial symmetry is a type of symmetry where the body of the organism can be divided into identical halves by any plane passing through its central axis. In the case of Hydra, it has a tubular body with tentacles around its mouth that can be extended and retracted in any direction, giving it radial symmetry. Other examples of radially symmetric organisms include jellyfish, sea anemones, and starfish.

Read lesson note on Organization Of Life (WAEC)

Organization Of Life

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Question 20 Report

The recycling method of solid waste disposal is unsuitable for

organic matter Correct answer

glass

plastic

metal scraps

Answer Details

The recycling method of solid waste disposal is unsuitable for organic matter. This is because organic matter can decompose over time and turn into compost, which is a valuable soil conditioner. However, glass, plastic, and metal scraps can be recycled and used again, which reduces the amount of waste that ends up in landfills or incinerators. Therefore, the recycling method is not suitable for organic matter, but it is suitable for glass, plastic, and metal scraps.

Read lesson note on Ecosystem (WAEC)

Ecosystem

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Question 21 Report

In the root vascular system, the stele is directly surrounded by the

pericycle Correct answer

cortex

endodermis

parenchyma

Answer Details

Read lesson note on Organization Of Life (WAEC)

Organization Of Life

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Question 22 Report

The stage in the life history of a moth responsible for the destruction of agricultural crops is the

nymph

imago

pupa

caterpillar Correct answer

Answer Details

The stage in the life history of a moth responsible for the destruction of agricultural crops is the caterpillar. Caterpillars are the larval stage of moths and butterflies, and they are known for their voracious appetite for plant matter. They have strong mandibles that allow them to chew through leaves, stems, and other plant parts, which can result in significant damage to crops. Once the caterpillar has completed its feeding stage, it will pupate and eventually emerge as an adult moth.

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Question 23 Report

The function of the fluid - filled pericadium is to

reduce the friction caused by the pumping movements of the heart Correct answer

supply the heart with organisms from attacking the heart

prevent disease organism from attacking the heart

reduce the intensity of the pumping

Answer Details

The pericardium is a fluid-filled sac that surrounds and protects the heart. Its main function is to reduce friction and cushion the heart as it contracts and relaxes during each heartbeat. Essentially, it acts as a shock absorber for the heart, preventing damage from the friction caused by the movement of the heart. Therefore, the correct option is: "reduce the friction caused by the pumping movements of the heart".

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

The Cell And Its Environment: Physical And Biophysical Processes

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Question 24 Report

The importance of practising crop rotation in agriculture is to

maintain soil fertility Correct answer

improve the nutritional value of crops

control soil erosion

ensure the growth of crops

Answer Details

Crop rotation is an agricultural practice of planting different crops in the same field in successive seasons to maximize yields and maintain soil health. The importance of practicing crop rotation is to maintain soil fertility. Planting the same crop in the same field season after season can cause the depletion of certain nutrients in the soil, leading to reduced yields and poor crop quality. Crop rotation helps to balance soil fertility by allowing the soil to recover and replenish nutrients that were used up by the previous crop. This can improve soil structure, reduce soil erosion, and enhance the growth of subsequent crops. Additionally, crop rotation can help to control pests and diseases that may attack a specific crop by breaking their life cycles and reducing their population in the soil.

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

Read lesson note on Soil (WAEC)

Read lesson note on Ecosystem (WAEC)

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

Soil

Ecosystem

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Question 25 Report

The transition from amphibians to mammals involves the limb becoming arranged to support the weight more effectively requiring modifications in the

collar bones and coccyx

pectoral and pelvic girdles Correct answer

scapulae and clavicles

vertebrae and sternum

Answer Details

The transition from amphibians to mammals involved the evolution of limbs that were arranged to support the weight of the animal more effectively. This required modifications in the pectoral and pelvic girdles. The pectoral and pelvic girdles are the bones that connect the limbs to the axial skeleton, and they provide support for the entire body. In mammals, the pectoral and pelvic girdles became more robust and were modified to provide a stronger attachment for the limbs. This allowed mammals to support their weight on land and to move more efficiently. The collar bones and coccyx, scapulae and clavicles, and vertebrae and sternum are also important bones, but they were not the primary focus of modification in the transition from amphibians to mammals.

Read lesson note on Support And Movement (JAMB)

Read lesson note on Growth (JAMB)

Support And Movement

Growth

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Question 26 Report

Which of the following is likely to have a higher concentration of the mitochondria?

Sperm cell Correct answer

white blood cell

Egg cell

Red blood cell

Answer Details

The sperm cell is likely to have a higher concentration of the mitochondria. Mitochondria are organelles responsible for producing energy in cells, and the sperm cell requires a lot of energy to swim and reach the egg for fertilization. Therefore, to meet this high energy demand, the sperm cell needs a high concentration of mitochondria. On the other hand, white blood cells and red blood cells have lower energy demands, while the egg cell is relatively large and contains yolk, which provides energy for early embryonic development, so they do not require as many mitochondria as sperm cells.

Read lesson note on Cell Structure (WAEC)

Cell Structure

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Question 27 Report

Which of the following is a homostatic response in humans?

Withdrawing the hand from a hot object

The mouth getting watery when food is sighted

yawning owing to tiredness

shivering in a cold environment Correct answer

Answer Details

Shivering in a cold environment is a homostatic response in humans. Homostasis is the ability of the body to maintain a stable internal environment, despite external changes. Shivering is a mechanism that helps the body maintain its internal temperature in a cold environment by generating heat through muscle contractions. This is an example of a homostatic response, as it helps to maintain the body's internal temperature within a normal range. The other options are not examples of homostatic responses. Withdrawing the hand from a hot object is a reflex action to protect the body from injury. The mouth getting watery when food is sighted is a digestive response. Yawning due to tiredness is a physiological response, but not homostatic.

Read lesson note on Regulation Of Internal Environment (WAEC)

Read lesson note on Support And Movement (JAMB)

Regulation Of Internal Environment

Support And Movement

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Question 28 Report

A yellow maize is crossed with a white maize and the first filial generation produce yellow maize only. The white trait is said to exhibit

dominance

recessiveness Correct answer

codominance

incomplete dominance

Answer Details

The white trait is said to exhibit recessiveness. When a yellow maize (which has the dominant yellow trait) is crossed with a white maize (which has the recessive white trait), the resulting first filial generation will only show the dominant yellow trait because it masks the expression of the recessive white trait. However, the recessive trait is still present in the genetic makeup of the plants, and may appear in future generations if certain conditions are met. This is because the recessive trait only shows when two copies of the recessive gene are present in the genotype.

Read lesson note on Genetic Terminologies (WAEC)

Genetic Terminologies

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Question 29 Report

Hydrostatic skeleton is the type of supporting system found in

mammals

reptiles

oligochaetes Correct answer

arthropods

Answer Details

Hydrostatic skeleton is the type of supporting system found in oligochaetes and some other invertebrates like cnidarians and flatworms. In this type of skeleton, the body is supported by a fluid-filled cavity, which acts as a hydrostatic skeleton. The muscles of the body wall contract against the fluid, generating a pressure that supports the body and provides the necessary rigidity for movement. The oligochaetes, which are a type of annelid worms, use hydrostatic skeletons to burrow in soil and move through water.

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

Tissues And Supporting Systems:

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Question 30 Report

From the diagram above Birth control by vasectomy is achieved by severing the structure labelled

III Correct answer

Answer Details

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Question 31 Report

An evidence of a common ancestral for fishes, amphibians, reptiles, birds and mammals is the

possession of wings by birds and bats

cold-bloodedness of fishes, amphibians and reptile

presence of gilll clefts in vertebrate embryos

Correct answer

possession of scale by fish and reptiles

Answer Details

The evidence of a common ancestor for fishes, amphibians, reptiles, birds and mammals is the presence of gill clefts in vertebrate embryos. All vertebrate embryos at some point during development have gill slits, which are openings in the neck region that eventually develop into various structures in different species. This is evidence of a shared ancestry because it indicates that these organisms share a common developmental pathway that has been modified over time through evolution to produce the diverse range of adult forms seen in these groups. Possession of wings by birds and bats, cold-bloodedness of fishes, amphibians, and reptiles, and possession of scales by fish and reptiles are all characteristics that have evolved independently in these groups and are not unique to their common ancestor.

Read lesson note on Theories Of Evolution (JAMB)

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

Theories Of Evolution

Evolution (Theories and Evidence)

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Question 32 Report

The main function of the structure labelled I is to

store food for the young plant

pull the young shoot above the ground

store water for the seedling

protect the young plumule Correct answer

Answer Details

Read lesson note on Internal Structure Of A Flowering Plant (JAMB)

Internal Structure Of A Flowering Plant

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Question 33 Report

The population density of Tridex in an abandoned square farm land of side 200 m was found to be 5 plants per m2. The population size of the plant on the farm is

1000

40000

200000 Correct answer

Answer Details

To calculate the population size of Tridex on the farm, we need to know the total area of the farm land. Since the farm land is square and has a side length of 200 m, the area is given by the formula: Area = Side length x Side length Area = 200 m x 200 m Area = 40,000 m2 Now, we know that the population density of Tridex is 5 plants per m2. To find the population size, we need to multiply the population density by the total area of the farm: Population size = Population density x Area Population size = 5 plants/m2 x 40,000 m2 Population size = 200,000 plants Therefore, the population size of Tridex on the farm is 200,000. Option (d) is the correct answer.

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

Co-ordination And Control

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Question 34 Report

From the diagram above the structure labelled I originates from the

liver

kidney Correct answer

small intestine

stomach

Answer Details

Read lesson note on Cell Structure (WAEC)

Cell Structure

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Question 35 Report

From the diagram above the angle between the parts labelled II and III is the

bud

node

internode

axil Correct answer

Answer Details

Read lesson note on Nutrient Cycling In Nature (WAEC)

Read lesson note on Blood Transfusion (WAEC)

Read lesson note on Biology And Agriculture (WAEC)

Read lesson note on Cell Structure (WAEC)

Nutrient Cycling In Nature

Blood Transfusion

Biology And Agriculture

Cell Structure

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Question 36 Report

A non - renewable alternative source of energy is

wind generator

solar panels

nuclear energy Correct answer

hydroelectric power

Answer Details

A non-renewable alternative source of energy is nuclear energy. Nuclear energy is obtained through the fission of uranium atoms in a process that produces heat, which is used to generate electricity. While it is an alternative to traditional fossil fuels, such as oil and coal, which are also non-renewable, nuclear energy is also controversial due to concerns about safety and the disposal of radioactive waste.

Read lesson note on Biological Fuel Generation (WAEC)

Biological Fuel Generation

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Question 37 Report

The urinary tubules of the kidney function through

osmosis and diffusion

active transport and osmosis

ultrfiltration and selective reabsorption Correct answer

active transport and cytoplasmic streaming

Answer Details

The urinary tubules of the kidney function through ultrafiltration and selective reabsorption. The process of ultrafiltration involves the movement of small molecules, such as water and ions, from the blood in the glomerulus into the renal tubules. This is driven by the pressure of the blood in the glomerulus and results in the formation of a filtrate that contains water, ions, and other small molecules. Selective reabsorption then takes place in the renal tubules, where some of the substances that were filtered out of the blood during ultrafiltration are reabsorbed back into the bloodstream. This process is selective because only certain substances, such as glucose, amino acids, and ions, are reabsorbed, while other substances, such as urea and excess water, are left behind in the tubules to be excreted as urine. Therefore, the correct answer is ultrafiltration and selective reabsorption.

Read lesson note on Reproductive System (WAEC)

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

Reproductive System

Excretory Systems And Mechanisms; Types Of Excretory Systems

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Question 38 Report

The only caste in the termite colony are the members can feed themselves are the

reproductives

workers Correct answer

nymphs

soldiers

Answer Details

The members in the termite colony that can feed themselves are the workers. Workers are a caste of termites that are responsible for foraging for food, building and maintaining the nest, and caring for the other members of the colony. They are the only caste that can feed themselves, as they have well-developed mandibles and can digest cellulose, the main component of wood, which is a common food source for termites. The other castes, such as the reproductives, nymphs, and soldiers, rely on the workers to feed them.

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

Forms In Which Living Cells Exist

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Question 39 Report

Angiosperms and gymnosperms belong to the class

schizophyta

spermatophyta Correct answer

pteridophyta

bryophyta

Answer Details

Angiosperms and gymnosperms belong to the class Spermatophyta. Spermatophyta is a group of plants that reproduce by producing seeds. This class includes two major divisions, gymnosperms and angiosperms. Gymnosperms are plants that have seeds without any protective covering or fruit, while angiosperms are plants that have seeds enclosed in a fruit. Both of these divisions are further divided into various families and species.

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Question 40 Report

A function of the part labelled II is to

equalize pressure on both sides of the tympanum Correct answer

conduct sound waves to the brain

help the animal maintain balance or posture

transform sound waves into electric impulses

Answer Details

Read lesson note on Cell Structure (WAEC)

Cell Structure

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Question 41 Report

Evapouration and transpiration are respectively represented by the components labelled

I and II

Correct answer

II and III

III and IV

IV and I

Answer Details

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Question 42 Report

The type of germination illustrated is termed

hypogeal

epicotyl

epigeal Correct answer

hypocotyl

Answer Details

Read lesson note on Nutrition (JAMB)

Nutrition

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Question 43 Report

At which temperature will cockroaches not survive after 10 days

15oC Correct answer

19oC

24oC

33oC

Answer Details

Cockroaches are ectothermic animals, meaning their body temperature is regulated by the surrounding environment. They are known to thrive in warm environments, with some species preferring temperatures above 30oC. Studies have shown that cockroaches exposed to temperatures below their lower thermal limits can lead to death. Therefore, the temperature at which cockroaches will not survive after 10 days will depend on the temperature being lower than their lower thermal limit. From the given options, the lowest temperature is 15oC, which is lower than the lower thermal limit for most species of cockroaches. Hence, 15oC is the most likely option for the temperature at which cockroaches will not survive after 10 days.

Read lesson note on Plant Nutrition (WAEC)

Plant Nutrition

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Question 44 Report

When an animal has a dark-coloured dorsal surface and a light-colouration ventral surface, this is an adaptation called

concealment colouration

countershading Correct answer

colour blending

disruptive colouration

Answer Details

The adaptation described in the question is called countershading. Countershading is a form of camouflage in which the upper part of an animal's body is darkly colored while the lower part is light-colored. This adaptation helps to conceal the animal from predators or prey by breaking up its outline and making it more difficult to see. The dark dorsal surface blends in with the dark background above, while the light ventral surface blends in with the brighter background below, making the animal appear more uniform in color and therefore harder to detect.

Read lesson note on Adaptive Colouration (WAEC)

Adaptive Colouration

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Question 45 Report

I. Rattus rattus II. Agama agama III. Bufo regularis IV. tilipia zilli

The order of evolutionary advancement to the above vertebrates is

I, II, III, IV

I, IV, III, II

II, III, IV, I

IV, III, II, I

Correct answer

Answer Details

The order of evolutionary advancement of the above vertebrates can be explained as follows: Rattus rattus is a species of rodent, which belongs to the class Mammalia. Mammals are generally considered to be more evolutionarily advanced than other vertebrates such as reptiles, amphibians and fish. Agama agama is a species of lizard, which belongs to the class Reptilia. Reptiles are considered less evolutionarily advanced than mammals, but more advanced than amphibians and fish. Bufo regularis is a species of toad, which belongs to the class Amphibia. Amphibians are considered less evolutionarily advanced than reptiles and mammals, but more advanced than fish. Tilapia zilli is a species of fish, which belongs to the class Actinopterygii. Fish are generally considered to be the least evolutionarily advanced of the vertebrates. Therefore, the order of evolutionary advancement from the above vertebrates is: I, II, III, IV

Read lesson note on Heredity (JAMB)

Heredity

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Question 46 Report

From the diagram above the part labelled IV represents the

colon

ileum

caecum

duodenum

Correct answer

Answer Details

Read lesson note on Alimentary System (WAEC)

Alimentary System

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Question 47 Report

The blackfly is a vector of

malaria

trypanosomiasis

onchocerciasis Correct answer

yellow fever

Answer Details

The blackfly is a vector of onchocerciasis, also known as river blindness. A vector is an organism, such as a mosquito or fly, that transmits a disease-causing organism, such as a parasite or virus, from one host to another. In the case of the blackfly, it can transmit a parasite called Onchocerca volvulus, which can cause severe itching, skin lesions, and eventually blindness if left untreated. Onchocerciasis is a serious disease that affects millions of people in Africa, Latin America, and Yemen, and the blackfly is one of its primary vectors.

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

Read lesson note on Nervous Coordination (WAEC)

Properties And Functions Of The Living Cell

Nervous Coordination

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Question 48 Report

Which of the following is the best explanation for a child who is phenotypically short and born of two tall parents

The father possesses a gene for shortness

The mother posesses a gene for shortness

Nature makes the child short

Both parents possess gene for shortness Correct answer

Answer Details

If a child is phenotypically short and both parents are tall, the most likely explanation is that both parents carry a recessive gene for shortness. When both parents are heterozygous for a recessive trait, there is a 25% chance that their child will inherit two copies of the recessive allele and express the trait. In this case, the trait is shortness. Therefore, it is most likely that both parents possess the gene for shortness, but it is only expressed in the child because they inherited two copies of the recessive allele.

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Question 49 Report

Secondary succession is much faster than primary succession because

pioneer colonizers are more in number Correct answer

soil is already present

secondary seres require less nutrients

species competition is increased

Answer Details

Secondary succession is usually much quicker than primary succession for the following reasons:

There is already an existing seed bank of suitable plants in the soil.

Root systems undisturbed in the soil, stumps and other plant parts from previously existing plants can rapidly regenerate.

The fertility and structure of the soil has also already been substantially modified by previous organisms to make it more suitable for growth and colonization.

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Question 50 Report

The leech and the earthworm belong to the

mollusces

crustaceans

arachnides

annelides Correct answer

Answer Details

The leech and the earthworm both belong to the phylum Annelida. Annelids are segmented worms with a body that is divided into many small, repeating units. They have a closed circulatory system, a digestive system, and a nervous system. The leech and the earthworm are both hermaphrodites, which means they have both male and female reproductive organs. They play an important role in maintaining soil health and are often used as bait for fishing.

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

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

Forms In Which Living Cells Exist

Tissues And Supporting Systems:

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