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Civil and Mechanical

w Biology 20

Written by Admin December 9, 2025December 9, 2025

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Question 1 of 50

1. Question

The properties of endocrine system include the following except

secretion of hormones
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transportation by blood to target organ
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having specific effect
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release of secretion into ducts
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Question 2 of 50

2. Question

Replication of DNA molecules is catalysed by an enzyme called

polymerase
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ptyalin
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pepsin
Correct Incorrect Correct answer

amylase
Correct Incorrect Correct answer

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Question 3 of 50

3. Question

Which of the following diseases can be inherited?

Pneumonia
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Whooping cough
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Sickle cell anemia
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Malaria
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Question 4 of 50

4. Question

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?

I
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II
Correct Incorrect Correct answer

III
Correct Incorrect Correct answer

IV
Correct Incorrect Correct answer

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Incorrect
Question 5 of 50

5. Question

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

copper sulphate solution
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lime water
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hydrochloric acid
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sodium hydroxide solution
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Question 6 of 50

6. Question

Who proposed the theory of evolution by natural selection

Darwin
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Lamark
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Aristotle
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Linnaeus
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Question 7 of 50

7. Question

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

both organisms involved benefit
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none of the organisms benefits or harm each other
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both organisms harm each other
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only one of the organisms is harmed
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Question 8 of 50

8. Question

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.

The yeast cells carried out photosynthesis while the mould did not
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Photosynthesis does not take place in the absence of oxygen
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Respiration can take place in yeast cells in the absence of oxygen
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Respiration does not occur in the mould
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Question 9 of 50

9. Question

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

pig's bladder
Correct Incorrect Correct answer

Unripe pawpaw fruit
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Yam tuber
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Sheet of cellophane
Correct Incorrect Correct answer

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Question 10 of 50

10. Question

The diagram below is an illustration of an ecological instrument. Study it an answer the question below; When the instrument is in use, it is usually

placed slightly above soil level
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placed on a table
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suspended in air
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suspended to moving water
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Question 11 of 50

11. Question

Conservation of natural resources does not

maintain a balanced ecosystem
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preserve the beauty of nature
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attract tourists
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threaten the survival of species
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Question 12 of 50

12. Question

The diagram below is an illustration of a cross between plants A and B of the same species. Study it and answer the question below; If the F1 generation are plants with high yield and resistance, the genotype of the F1 generation plants would be

YYRR
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YyRr
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yyRr
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yyrr
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Question 13 of 50

13. Question

The diagram above is an illustration of the longitudinal section of a plant organ. Study to answer the question below. Food is stored in the part labeled

I
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II
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III
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IV
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Question 14 of 50

14. Question

Measurements of height and weight of students in a class show

discontinuous variation
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continuous variation
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shortness is more prevalent
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fatness is less prevalent
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Question 15 of 50

15. Question

The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below; Organism Number in the habitat habitat W habitat Y Plankton 126 0 Antelope 0 51 Water flea 10 0 Tilapia 23 0 Lion 0 6 Frog 6 0 Grass 0 250 Which of the following statements about habitat W is correct? The

absence of lions and antelopes shows that the habitat is terrestrial
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presence of Tilapia and planktons shows that the habitat is not aquatic
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type of organisms present indicate that habitat is aquatic
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absence of grasses indicates that the habitat is terrestrial
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Question 16 of 50

16. Question

The diagram below is an illustration of an experimental set-up. Study it and answer the question below; The set-up can measure comparatively the rae of

evaporation from leaves on a single shoot under different experimental conditions
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salt uptake by shoots from different plants
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transpiration of a single shoot of a plant under different experimental conditions
Correct Incorrect Correct answer

water uptake by roots of different plants
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Question 17 of 50

17. Question

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

diffusion
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transpiration pull
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osmosis
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active transport
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Question 18 of 50

18. Question

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

land
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water
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wildlife
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minerals
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Question 19 of 50

19. Question

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;

I and II
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II and III
Correct Incorrect Correct answer

II and IV
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III and IV
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Question 20 of 50

20. Question

The first stable product of photosynthesis is

starch
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fructose
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glucose
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sucrose
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Question 21 of 50

21. Question

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

Collenchyma
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Parenchyma
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Xylem
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Phloem
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Question 22 of 50

22. Question

Use the following Classes of Arthropoda to answer the question below I. Crustacea II. Insecta III. Arachinda IV. Chilopoda Which of the classes is characterised by the possession of two pairs of antennae?

I
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II
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III
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IV
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Question 23 of 50

23. Question

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

plasma membrane
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nuclear membrane
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mitochondrion
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endoplasmic reticulum
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Question 24 of 50

24. Question

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

Volvox
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Spirogyra
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Paramecium
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Euglena
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Question 25 of 50

25. Question

The part of the cetral nervous system that controls unconscious actions in humans is the

cerebellum
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cerebrum
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spinal cord
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optic nerves
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Question 26 of 50

26. Question

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

Mineral
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Air
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Soil
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Water
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Question 27 of 50

27. Question

An example of a trace elements is

potassium
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calcium
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magnesium
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copper
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Question 28 of 50

28. Question

The diagram below is an illustration of the longitudinal section of a plant organ. Study it and answer the question below; The plant is a?

stem tuber
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bulb
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stolon
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runner
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Question 29 of 50

29. Question

Use the list of insects below to answer the question below; I. Cotton stainer II. Honeybee III. Termite IV. Weevil Which of the insects destroys grains?

I
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II
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III
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IV
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Question 30 of 50

30. Question

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

Light is not necessary for swarming
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They avoid day-flying birds
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Light destroys their wings
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They can only see in the dark
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Question 31 of 50

31. Question

The diagram below is an illustration of the longitudinal section of a plant organ. Study it and answer the question below; The part labeled i is the

apical bud
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scale leaf
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adventitious root
Correct Incorrect Correct answer

fleshy leaf
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Question 32 of 50

32. Question

Which of the following statements about chromosomes is correct?

All the chromosomes of a species are the same shape
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The number present in a specie is constant
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They are neatly arranged in a cytoplasm
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They bear ribosomes on their outer membranes
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Question 33 of 50

33. Question

The position occupied by an organism in food chain is the

energy level
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niche
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trophic level
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biomass
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Question 34 of 50

34. Question

The cell as the basic unit of life consists of

cell wall and vacuole
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nucleus and cell wall
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cytoplasm and nucleus
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cytoplasm and vacuole
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Question 35 of 50

35. Question

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

O
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A
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B
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AB
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Question 36 of 50

36. Question

The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below; Organism Number in the habitat habitat W habitat Y Plankton 126 0 Antelope 0 51 Water flea 10 0 Tilapia 23 0 Lion 0 6 Frog 6 0 Grass 0 250 What type of habitat is W?

Rainforest
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Pond
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Desert
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Ocean
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Question 37 of 50

37. Question

What happens when the ciliary muscles of the eye contract? The

lens become more concave
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lens become more convex
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lens gets a longer focal length
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suspensory ligament becomes tight
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Question 38 of 50

38. Question

The table below shows the number of some organisms in habitats W and Y. Study it to answer the question below; Organism Number in the habitat W habitat Y Plankton 126 0 Antelope 0 51 Water flea 10 0 Tilapia 23 0 Lion 0 6 Frog 6 0 Grass 0 250 The number of lions and antelopes in habitat Y shows that the lion

is the prey while the antelope is the predator
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is the predator while the antelope is the prey
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and the antelope are preys to each other
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and the antelopes are predators
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Question 39 of 50

39. Question

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

phenotypic variation
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discontinuous variation
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continuous variation
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genotypic variation
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Question 40 of 50

40. Question

The respiratory organ of a cockroach

air sac
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trachea
Correct Incorrect Correct answer

lung book
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lung
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Question 41 of 50

41. Question

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

is an agent of pollination
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is necessary for germination
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leads to flooding when in excess
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is used for irrigation
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Question 42 of 50

42. Question

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

transpiration of water by the shoot
Correct Incorrect Correct answer

evaporation of water from the leaves
Correct Incorrect Correct answer

absorption of water by the shoot
Correct Incorrect Correct answer

loss of mineral salts from the leaves
Correct Incorrect Correct answer

Correct

Incorrect
Question 43 of 50

43. Question

The diagram below is an illustrating of a cross between plants A and B of the same species. Study it to answer the question below; The process that gave rise to the F1 generation is

self fertilization
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cross fertilization
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out-breeding
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test cross
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Question 44 of 50

44. Question

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

gamma rays
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infra-red rays
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ultraviolet rays
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X-rays
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Question 45 of 50

45. Question

Soil with the finest texture is?

silt
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clay
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sand
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gravel
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Question 46 of 50

46. Question

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

unfused stigma
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fused style
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fused ovaries
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unfused anther
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Question 47 of 50

47. Question

The excretory product of some reptiles, birds and insects is

urea
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urine
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ammonia
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uric acid
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Question 48 of 50

48. Question

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

has no effect on the starch solution
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leads to the production of amino acids
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leads to the production of glucose
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digest the starch
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Question 49 of 50

49. Question

The part of the mammalian kidney that stores urine is the

capsule
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medulla
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pelvis
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bladder
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Question 50 of 50

50. Question

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

receiving the pollen grain
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attract pollinators
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germination of the pollen grain
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site for double fertilization in the plant Answer Details The function of the part labeled I is to receive the pollen grain. Part I, which is called the stigma, is the top part of the female reproductive structure of a flower called the pistil. The stigma is covered with a sticky substance that allows it to capture pollen grains that are transferred from the male reproductive structure, the anther, either by wind, insects or other means. Once the pollen grain has landed on the stigma, it can then germinate and produce a pollen tube that grows down through the style, which is the narrow part of the pistil connecting the stigma to the ovary. This allows the male gametes in the pollen to reach the ovules in the ovary, leading to double fertilization and the production of seeds. Therefore, the main function of the stigma is to receive the pollen grain and provide the site for germination and subsequent fertilization. It does not directly attract pollinators, although some flowers may have other structures, such as bright colors or strong scents, to help attract pollinators to the flower.
Correct Incorrect Correct answer

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