2022 WASSCE BIOLOGY 1 OBJECTIVE, QUESTIONS AND ANSWERS.

QUESTIONS

1. Which of the following organisms is slipper-shaped?

A. Chlamydomonas
B. Euglena
C. Amoeba
D. Paramecium

The diagram below is a pie chart showing the size of the four main Classes of the Phylum Arthropoda. Study it and answer questions 2 and 3.

2. Which of the portions represents the Class Insecta?

A. W
B. X
C. Y
D. Z

3. The other likely Classes are

A. Arachnida, Amphibia, Osteichthyes,
B. Myriapoda, Arachnida, Crustacea.
C. Hepaticae, Musci, Turbellaria.
D. Crustacea, Trematoda, Oligochaeta.

Use the information below to answer questions 4 and 5.
• Biological process I: Plants use gas X to produce gas Y on a sunny day.
• Biological process II: Plant roots absorb water from the soil.

4. Biological processes I and II, respectively, are

A. translocation, nitrogen cycling.
B. photosynthesis, osmosis.
C digestion, transpiration.
D. photosynthesis, reproduction.

5. Gases X and Y are obtained respectively from

A. the end of the process and the soil.
B. water and the atmosphere.
C. animals and the end of the process.
D. water and the soil.

6. Which of the following cellular organelles produces ATP from carbohydrates?

A. Lysosome
B. Chloroplast
C. Mitochondrion
D. Chromoplast

Use the physiological processes listed below to answer questions 7 to 9.
I. Osmosis
II. Transpiration
III. Flaccidity
IV. Guttation

7. Which of the processes would lead to wilting in plants?

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

8. The process that occurs in plants when humidity is high is

A. L
B. II.
C. III.
D. IV

9. Which of the processes is affected by wind?

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

10. The gas present in exhaled air is

A. nitrogen.
B. carbon (IV) oxide.

C. oxygen.
D. hydrogen.

11. When using lime water to test for a gas in the laboratory, and the test is positive, the gas is

A. carbon (IV) oxide.
B. nitrogen.
C. oxygen.
D. hydrogen.

12. The acetabulum articulates with

A. femur.
B. rib.
C. humerus.
D. clavicle.

13. A pulse in humans is the

A. pumping action of the heart to transport blood around the body.
B. dilation of arteries to accommodate blood flowing through them.
C. contraction of veins to allow blood flow into them.
D. contraction of arteries to let blood out.

14. Which of the following organisms respires through the body surface?

A. Fish
B. Amoeba
C Lizard
D. Mouse

15. Which of the following statements about urine formation is not correct?

A. Concentrated urine is produced under the influence of antidiuretic hormone
B. The total volume of urine produced depends on the amount of water to be excreted
C. Dilute urine is produced when there is an excess intake of water
D. Dilute urine is produced under the influence of antidiuretic hormone

16. The gland that secretes insulin in humans is

A. pituitary.
B. thyroid.
C. pancreas.
D. parathyroid.

17. Which of the following senses of a dog will be affected when its olfactory lobes are damaged?

A. Hearing
B. Sight
C. Smell
D. Touch

The diagram below is an illustration of the mammalian eye. Use it to answer questions 18 and 19.

18. The function of the part labelled IV is that it

A. controls the amount of light entering the eye.
B. refracts light rays to focus on an image
C. nourishes the cells of the eye.
D. allows light rays to enter the eye.

19. The function of the part labelled I is that it

A. Protects and maintains the shape of the eyeball
B. Lubricate the eye
C. Forms the muscular ciliary body
D. Makes formed images sharper.

The diagrams below are illustrations of different sections of a fruit. Study them and answer questions 20 and 21.

20. What type of placentation is illustrated in X?

A. Parietal
B. Axile
C. Marginal
D. Free-central

21. The type of section in Y is

A. radial.
B transverse.
C. longitudinal.
D. bilateral.

Use the pigments below to answer questions 22 and 23.
I. Chlorophyll
II. Melanin
III. Carotene
IV. Anthocyanin

22. The pigment that is useful for food production in plants is

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

23. Which of the following statements about the pigments is not correct?

A. Green leaves have their colour because of I
B. The presence of II in animals makes them albinos
C. III is a pigment in plants, and II is a pigment in animals

D. IV is an excretory product of plants

The diagrams below are illustrations of leaf Y that had its colour changed to Z after iodine solution was added to it to test it for starch. Study it and answer questions 24 and 25.

24. What would be the colour of the part labelled I in the leaf labelled Z?

A. Brown
B. Blue-green
C. Blue-black
D. White

25. An inference of a positive result from the experiment is that

A. light is necessary for photosynthesis.
B. a variegated leaf is not suitable for the experiment.
C. starch is present in the parts that are green.
D. the parts that are white do not receive sunlight.

26. Poor growth with purpling of leaves in plants is a symptom of deficiency of

A. phosphorus.
B. potassium.
C. magnesium.
D. calcium.

27. Which of the following statements about the digestive system is correct? The

A. intestines are coiled and tubular
B. villi absorb undigested food
C. trachea and oesophagus are constantly closed
D. lung is an organ of digestion

28. A set of similar teeth possessed by some lower vertebrates is known as

A. milk teeth dentition.
B. homodont dentition.
C. permanent teeth dentition.
D. heterodont dentition

29. Which of the following adaptive features is associated with parasitic plants? Possession of

A. rhizoids
B. haustoria
C. holdfast
D. hanging roots

30. A stable, self-sustaining environment produced by an interaction between the biotic and abiotic components is described as

A. a niche.
B. a community.

C. a biome.
D. an ecosystem.

31. Which of the following components is biotic in an ecosystem?

A. Fungus.
B. Light.
C. Soil.
D. Wind.

32. Dead organic materials are degraded into simple inorganic substances by fungi and

A. Rhizobium.
B. putrifying bacteria.
C. symbiotic bacteria.
D. nitrifying bacteria.

Study the feeding relationship below and answer questions 33 and 34.

33. The position that would be occupied by a lion is

A. I
В. II
C. III.
D. IV.

34. The position of the organism that receives energy directly from sunlight and uses it to make food is

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

35. An earthworm could be classified as a

A. producer.
B. decomposer.
C. secondary consumer.
D. tertiary consumer.

36. A fish detects vibrations in water using its

A. gill bar.
B. scales.
C. fins.
D. lateral line.

37. Which of the following methods of refuse disposal is most environmentally friendly?

A. Burning
B. Landfill
C. Composting
D. Incineration

38. Pollution by carbon (II) dioxide could be prevented by

A. using petrol as a source of fuel.
B. efficient burning of fuel.
C. using firewood as a source of fuel.
D. incomplete burning of fuel.

The diagram below illustrates the conservation technique of a natural resource. Use it to answer questions 39 and 40.

39. Which of the following natural resources is conserved using the illustrated technique?

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

40. The conservation technique illustrated is known as

A. contour ploughing.
B. surface terracing.
C. hill step.
D. gully erosion.

41. What does the use of plastic chairs in classrooms conserve?

A. Coal
B. Rocks
C. Wildlife
D. Trees

42. An individual with blood group AB can only donate blood to those with blood of groups

A. B.
B. A.
C. AB.
D. O.

43. A man and his wife, who are light-skinned, have four children with different skin colours. This could be due to

A. evolution.
B. linkage.
C. variation.
D. mitosis.

44. A single gene mutation is referred to as

A. point mutation.
B. deletion.
C. chromosomal mutation.
D. inversion.

45. Which of the following ratios would not be observed in a monohybrid cross?

A 1:1
B. 1:2:1
C. 3:1
D. 9:3:3:1

46. Which of the following statements about chromosomes is correct?

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

In Drosophila sp., the gene for long wings is dominant to the gene for vestigial wings. Two heterozygous long-winged flies were crossed, and the female laid a batch of 92 eggs. Use the information to answer questions 47 and 48.

47. How many Drosophila eggs would develop into long- winged flies?

A. 92
B. 69
C. 46
D. 23

48. What proportion of the flies developing from the eggs would be homozygous for long wings?

A. 25%
B. 50%
C. 75%
D. 100%

49. Which of the following groups of animals are mammals generally believed to have evolved from?

A. Reptilia
B. Fish
C. Amphibia
D. Bird

50. Complex social behaviour and organisation are found mostly in animals belonging to the Class

A. Mammalia.

B. Amphibia.

C. Aves.
D. Reptilia.

ANSWERS

1. D. Paramecium
2. A. W
3. B. Myriapoda, Arachnida, Crustacea.
4. B. photosynthesis, osmosis.
5. C. animals and the end of the process.
6. C. Mitochondrion
7. A. I
8. D. IV
9. A. I
10. B. carbon (IV) oxide.
11. A. carbon (IV) oxide.
12. A. femur.
13. A. pumping action of the heart to transport blood around the body.
14. B. Amoeba
15. D. Dilute urine is produced under the influence of antidiuretic hormone
16. C. pancreas.
17. C. Smell
18. A. controls the amount of light entering the eye.
19. D. Makes formed images sharper.
20. B. Axile
21. C. longitudinal.
22. A. I
23. B. The presence of II in animals makes them albinos
24. C. Blue-black
25. C. starch is present in the parts that are green.
26. A. phosphorus.
27. A. intestines are coiled and tubular
28. B. homodont dentition.
29. B. haustoria
30. D. an ecosystem.
31. A. Fungus.
32. B. putrifying bacteria.
33. A. I
34. D. IV.
35. B. decomposer
36. D. lateral line.
37. C. Composting
38. B. efficient burning of fuel.
39. C. Soil
40. B. surface terracing.
41. D. Trees
42. C. AB.
43. C. variation.
44. A. point mutation.
45. D. 9:3:3:1
46. C. The number present in a species is constant
47. B. 69
48. A. 25%
49. D. Bird
50. A. Mammalia.

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