Biology 2020

Objective Questions

The cell as the basic unit of life consists of:

(A) Cell wall and vacuole (B) Nucleus and cell wall (C) Cytoplasm and nucleus (D) Cytoplasm and vacuole

Correct Answer: C) Cytoplasm and nucleus

Use the following Classes of Arthropoda to answer the question below.

I. Crustacea
II. Insecta
III. Arachinda
IV. Chilopoda

Which members of the classes live mainly in an aquatic habitat?

A) I B) II C) III D) IV

Correct Answer: A) I

Which of the classes is characterized by the possession of two pairs of antennae?

A) I B) II C) III D) IV

Correct Answer: A) I

The organism with spiral chloroplasts and nucleus suspended by cytoplasmic strands is:

A) Volvox B) Spirogyra C) Paramecium D) Euglena

Correct Answer: B) Spirogyra

The network of double membrane that conveys materials through the cytoplasm is the:

A) Plasma membrane B) Nuclear membrane C) Mitochondrion D) Endoplasmic reticulum

Correct Answer: D) Endoplasmic reticulum

Food is stored in the part labeled
A. I
B. II
C. III
D. IV

A) Stem tuber B) Bulb C) Stolon D) Runner

Correct Answer: B) Bulb

The plant is a:

A) Stem tuber B) Bulb C) Stolon D) Runner

Correct Answer: B) Bulb

The part labeled I is the:

A) Apical bud B) Scale leaf C) Adventitious root D) Fleshy leaf

Correct Answer: B) Scale leaf

Which of the following materials is not a living semi-permeable membrane?

A) Pig's bladder B) Unripe pawpaw fruit C) Yam tuber D) Sheet of cellophane

Correct Answer: D) Sheet of cellophane

In an experiment, mould and yeast cells were transferred into an environment with low oxygen concentration. After a few days, the mould dies while the yeast cells did not. Which of the following statements best explains the following observation?

A) The yeast cells carried out photosynthesis while the mould did not B) Photosynthesis does not take place in the absence of oxygen C) Respiration can take place in yeast cells in the absence of oxygen D) Respiration does not occur in the mould

Correct Answer: C) Respiration can take place in yeast cells in the absence of oxygen

Which of the following tissues does not provide support in flowering plants?

A) Collenchyma B) Parenchyma C) Xylem D) Phloem

Correct Answer: B) Parenchyma

The diagram is an illustration of an experimental set-up. Study it and answer the question

The set-up directly measures:

A) Transpiration of water by the shoot B) Evaporation of water from the leaves C) Absorption of water by the shoot D) Loss of mineral salts from the leaves

Correct Answer: A) Transpiration of water by the shoot

The set-up can measure comparatively the rate of:

A) Evaporation from leaves on a single shoot under different experimental conditions B) Salt uptake by shoots from different plants C) Transpiration of a single shoot of a plant under different experimental conditions D) Water uptake by roots of different plants

Correct Answer: C) Transpiration of a single shoot of a plant under different experimental conditions

The respiratory organ of a cockroach is:

A) Air sac B) Trachea C) Lung book D) Lung

Correct Answer: B) Trachea

The excretory product of some reptiles, birds, and insects is:

A) Urea B) Urine C) Ammonia D) Uric acid

Correct Answer: D) Uric acid

The part of the mammalian kidney that stores urine is the:

A) Capsule B) Medulla C) Pelvis D) Bladder

Correct Answer: D) Bladder

The properties of the endocrine system include the following except:

A) Secretion of hormones B) Transportation by blood to target organs C) Having specific effects D) Release of secretion into ducts

Correct Answer: D) Release of secretion into ducts

Which organ in humans controls unconscious actions?

A) Medulla oblongata B) Cerebrum C) Cerebellum D) Spinal cord

Correct Answer: A) Medulla oblongata

What happens when the ciliary muscles of the eye contract?

A) The lens becomes more concave B) The lens becomes more convex C) The lens gets a longer focal length D) The suspensory ligament becomes tight

Correct Answer: B) The lens becomes more convex

The diagram is an illustration of a part of a flower. Study it and answer the question below

The function of the part labeled "I" is:

A) Receiving the pollen grain B) Passage for the male gamete to the ovary C) Germination of the pollen grain D) Site for double fertilization in the plant

Correct Answer: B) Passage for the male gamete to the ovary

The part labeled II is the:

A) Unfused stigma B) Fused style C) Fused ovaries D) Unfused anther

Correct Answer: C) Fused ovaries

The reagent used in testing for carbon (IV) oxide is:

A) Copper sulphate solution B) Lime water C) Hydrochloric acid D) Sodium hydroxide solution

Correct Answer: B) Lime water

Oxygen comes out of the stomata during photosynthesis through the process known as:

A) Diffusion B) Transpiration pull C) Osmosis D) Active transport

Correct Answer: A) Diffusion

The first stable product of photosynthesis is:

A) Starch B) Fructose C) Glucose D) Sucrose

Correct Answer: C) Glucose

An example of a trace element is:

A) Potassium B) Calcium C) Magnesium D) Copper

Correct Answer: D) Copper

Which of the following statements about a mixture of a protein-digesting enzyme and starch solution would be correct? The protein-digesting enzyme

A) has no effect on the starch solution B) leads to the production of amino acids C) leads to the production of glucose D) digest the starch

Correct Answer: A) has no effect on the starch solution

The mutualism type of relationship is different from a parasitic relationship because in mutualism

A) both organisms involved benefit B) none of the organisms benefits or harm each other C) both organisms harm each other D) only one of the organisms is harmed

Correct Answer: A) both organisms involved benefit

The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below

What type of habitat is W?

A) Rainforest B) Pond C) Desert D) Ocean

Correct Answer: B) Pond

Which of the following statements about habitat W is correct? The

A) absence of lions and antelopes shows that the habitat is terrestrial B) presence of Tilapia and planktons shows that the habitat is not aquatic C) type of organisms present indicate that habitat is aquatic D) absence of grasses indicates that the habitat is terrestrial

Correct Answer: C) type of organisms present indicate that habitat is aquatic

The number of lions and antelopes in habitat Y shows that the lion

A) is the prey while the antelope is the predator B) is the predator while the antelope is the prey C) and the antelope are preys to each other D) and the antelopes are predators

Correct Answer: B) is the predator while the antelope is the prey

The diagram above illustrates an ecological instrument. Study it and answer the question below

A disadvantage of the abiotic factor measured by the instrument is that it:

A) is an agent of pollination B) is necessary for germination C) leads to flooding when in excess D) is used for irrigation

Correct Answer: C) leads to flooding when in excess

When the instrument is in use, it is usually:

A) placed slightly above soil level B) placed on a table C) suspended in air D) suspended to moving water

Correct Answer: A) placed slightly above soil level

Soil with the finest texture is:

A) Silt B) Clay C) Sand D) Gravel

Correct Answer: B) Clay

The position occupied by an organism in a food chain is the:

A) Energy level B) Niche C) Trophic level D) Biomass

Correct Answer: C) Trophic level

The depletion of the ozone layer will result in the earth's surface receiving more:

A) Gamma rays B) Infra-red rays C) Ultraviolet rays D) X-rays

Correct Answer: C) Ultraviolet rays

Use the list of insects below to answer the question below:
I. Cotton stainer
II. Honeybee
III. Termite
IV. Weevil

The insects whose activities are both beneficial and harmful to humans are:

A) I and II B) II and III C) II and IV D) III and IV

Correct Answer: B) II and III

Which of the insects destroys grains?

A) I B) II C) III D) IV

Correct Answer: D) IV

Conservation of natural resources does not:

A) Maintain a balanced ecosystem B) Preserve the beauty of nature C) Attract tourists D) Threaten the survival of species

Correct Answer: D) Threaten the survival of species

A company was prohibited from producing bags made from natural leopard skin. This is an attempt to conserve:

A) Land B) Water C) Wildlife D) Minerals

Correct Answer: C) Wildlife

Which of the following substances is not a conservable natural resource?

A) Mineral B) Air C) Soil D) Water

Correct Answer: A) Mineral

A child that can receive blood donation from anybody belongs to the blood group:

A) O B) A C) B D) AB

Correct Answer: D) AB

Variation which exhibits a wide range from one extreme to the other is:

A) Phenotypic variation B) Discontinuous variation C) Continuous variation D) Genotypic variation

Correct Answer: C) Continuous variation

Measurements of height and weight of students in a class show:

A) Discontinuous variation B) Continuous variation C) Shortness is more prevalent D) Fatness is less prevalent

Correct Answer: B) Continuous variation

Which of the following statements about chromosomes is correct?

A) All the chromosomes of a species are the same shape B) The number present in a species is constant C) They are neatly arranged in a cytoplasm D) They bear ribosomes on their outer membranes

Correct Answer: B) The number present in a species is constant

Which of the following diseases can be inherited?

A) Pneumonia B) Whooping cough C) Sickle cell anemia D) Malaria

Correct Answer: C) Sickle cell anemia

The diagram above is an illustration of a cross between plants A and B of the same species. Study it to answer the question below

If the F1 generation are plants with high yield and resistance, the genotype of the F1 generation plants would be:

A) YYRR B) YyRr C) yyRr D) yyrr

Correct Answer: A) YYRR

The process that gave rise to the F1 generation is:

A) Self fertilization B) Cross fertilization C) Out-breeding D) Test cross

Correct Answer: B) Cross fertilization

Replication of DNA molecules is catalyzed by an enzyme called:

A) Polymerase B) Ptyalin C) Pepsin D) Amylase

Correct Answer: A) Polymerase

Who proposed the theory of evolution by natural selection?

A) Darwin B) Lamarck C) Aristotle D) Linnaeus

Correct Answer: A) Darwin

Which of the following statements best explains the reason why termites swarm at night?

A) Light is not necessary for swarming B) They avoid day-flying birds C) Light destroys their wings D) They can only see in the dark

Correct Answer: D) They can only see in the dark

Theory Questions

Explain briefly how the human ear carries out its function of balancing.

make a drawing 8 cm - 10 cm long of the structure of the human ear and label fully.
Describe briefly the structure of the middle ear in humans.

What is a deficiency disease?
Complete the table below by naming five nutrient deficiency diseases in humans and stating one remedy for each of the diseases.

Nutrient deficiency disease	Remedy

Outline a chemical test for

Starch in a tuber of yam
Glucose in orange fruit

Complete the table below

Disease	Causative organism	Vector	Control
Cholera
	Trypanosome
		Female Anopheles mosquito
Ringworm		None

Explain briefly the biological basis of preserving foods using each of the following methods

salting
Irradiation
Smoking

Explain briefly

independent assortment of genes
The reason blood group O in humans can only exist in homozygous form while blood groups A and B can exist both in homozygous and heterozygous forms.

Complete the table below by naming the classes of vertebrates in their evolutionary trend and giving one example each of the classes.

Classes of vertebrate	One example

Explain briefly the following types of fertilization in animals

external fertilization
internal fertilization

Name two groups of animal each that exhibit the types of fertilization in (a)

If the placenta in a pregnant woman is detached from the uterine wall, give three effect this will have on the foetus
Name three other features in the uterus of a pregnant woman that are useful for the development of the foetus

Explain briefly how the activities of organisms bring bout dynamic equilibrium in the habitat.
State four problems that organisms in the intertidal zone of a marine habitat could encounter.
Explain briefly the reasons that the following factors are necessary for germination

moisture
Viable seeds

Explain briefly the reason light energy is considered a limiting factor in the production of foods by autotrophs.

Practical Questions

Specimen A– Clayey Soil
Specimen B – A solution of one part of egg albumen mixed with two parts of water in a test tube/beaker.
Specimen C — Mushroom (freshly plucked).
Specimen D — Giant land snail.
Specimen E – Transverse section of ripe pawpaw fruit.
Specimen F– Transverse section of ripe tomato fruit.
Specimen G – Fresh pod of cowpea plant.
Specimen H – Complete, green pod of pride of Barbados plant.
Specimen J – Fresh Okro fruit
Specimen P– Potassium Permanganates solution.
Specimen Q– Granulated am sugar (100g) in a beaker.
Specimen R –5-day old boiled egg with shell intact store in a worm place /rotten egg with shell intact.
Specimen S – 10ml of lime/lemon juice in a test tube.

Study Specimens B, C and D and answer questions 1(a) To 1(f).

Place two drops of specimen B on a white tile and add two drops of iodine solution. Complete the table below with the test, observation and inference
Put 5 ml of specimen B into a test tube and add 2 ml of sodium hydroxide solution followed by three drops of copper (ii) tetraoxosulphate (VI) solution and shake Complete the table below with the test, observation and inference.

Give the name of each of the tests in 1(a)i) and 1(a)(ii). (i) ____________ (ii) _____________
State two ways by which specimen C is of economic importance.

Name the Kingdom to (1) (ii) which specimen C belongs.
State three reasons for the. answer in 1(d)(i).
Name four other organisms that belong to the same Kingdom as specimen C

Name the Phylum to which specimen D belongs
State three reasons for the answer in 1(d)(i)

Explain briefly the role of specimen C in nutrient cycling.
What is the mode of nutrition of specimen C

Study Specimens E, F, and H and answer questions 2(a) to 2(f).

What types of fruits are specimens E, F, and H? E: _________ F:_________ H: ___________
Name the types of placentation possessed by each of specimens E, F and H
Name one agent of dispersal each of specimens E, F and H?

Explain briefly how specimen E is dispersed.
State two types of nutrients present in specimen E.

What is the color of specimen H?
What does the color of specimen H signify?

Using the scalpel/blunt knife provided, cut open specimen H along the line of split from one side only.

Name the type of placentation found in specimen H
Make a drawing, 6 cm to 8 cm long of the two split halves of specimen H while still joined at one length and label fully.

Study Specimens P, Q and R and answer questions 4(a) to 4(d).

Use the information below to complete the following table

Add two drops of specimen P into a beaker containing water, leave it undisturbed and note the time it completely disperses in water.
Add a leveled teaspoonful of specimen Q into another beaker containing water, stir for one second and note the time it takes to completely dissolve.
Cut open specimen R and note the time the odor was perceived.
Give the medium of spread for each of the tests in 4(a)(i) to 4(a) i)
Name the sense organ in humans involved in each of the observations in 4(a)(i) to 4(a)(iii)

specimen	Test	Observation time(sec)	Medium of spread	sense organ

Name the biological phenomenon that occurred in 4(a)(iii)
State two factors each that will increase the rate of the phenomenon named in 4(b) for each of the activities in 4(a)(i) (ii) and (iii)
Gently place your thumb on the inked stamp pad provided

Neatly thumbprint clearly showing the pattern in the box below
Name the type of pattern in the fingerprint in 4(e)(i)
List three other types of fingerprints
tate three advantages of fingerprints
What type of variation is fingerprint?