WASSCE PAST QUESTION AND ANSWER IN BIOLOGY FOR 2022/2023

Waec Biology past questions

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WASSCE PAST QUESTION AND ANSWER IN BIOLOGY FOR 2023

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Biology Theory Paper 1

1. (a) Describe briefly the role of the stomach indigestion.
(b) (i) Name three parts of plants in which food can be stored
(ii) Give one example in each case.
(c) Explain briefly how the level of sugar in the mammalian blood can be regulated.

2. (a)(i) What is sexual reproduction?
(ii) Name four organs in mammals that produce sex hormones.
(iii) Name one sex hormone produced by each of the organs named in 2(a)(i).
(b) In a tabular form outline three differences between reproductions in lizards and birds.
(c) (i) How are identical twins forms in humans?
(ii) State three characteristics features of identical twins.

3. (a) Explain the following terms:
(i) disease;
(ii) symptoms of diseases
(b) (i) List two physical and two chemical barriers that prevent pathogens from penetrating the body of an organism.
(ii) Explain how vaccination protects the body from contracting infectious diseases.
(c) Distinguish between an antibody and an antigen.
(d) Name the causative agents of: (i) Malaria; (ii) Cholera; (iii) AIDS.

4. (i) What is respiration?
(ii) In a tabular form, state four differences between gaseous exchange and aerobic respiration
(b) (i) Explain the term residual air.
(ii) What is the importance of residual air to mammals?
(iii) State four characteristic features associated with respiratory structures.
(c) (i) What is oxygen debt?
(ii) Outline three activities that can result in oxygen debt.

5. (a) (i) What is conservation?
(ii) State six factors responsible for the decline of the abundance and variety of wildlife.
(b) Outline six ways in which the government can improve the situation in 5(a) (ii) above.
(c) (i) What is Eutrophication?
(ii) State two causes of eutrophication.

6. (a) What is photosynthesis?
List: (i) four external factors;
(ii) two internal factors; that affect the rate of photosynthesis.
(b) (i) List the major products of the light-dependent stage of photosynthesis.
(ii) State the importance of each of the products listed in 6(c) (i) above.
(c) (i) Explain why there are no green plants at the lower depths of some lakes.
(ii) State why decomposers are important to flowering plants.

7. (a) (i) What is a gene?
(ii) Differentiate between the terms genotype and phenotype.
(b) Explain the following terms: (i) hybrid; (ii) pure breeding; (iii) nucleotide.
(c) In garden pea seeds, the smooth seed coat is dominant over rough seed coat.
With the aid of a genetic diagram, determine the result expected if a homozygous rough pea is crossed with a smooth seed coat plant whose parent were rough-coated.

8. (a) (i)  Describe epigeal germination of a seed.
(ii) In a tabular form, state three differences between epigeal germination and hypogeal germination.
(b) (i)  What is seed dormancy?
(ii)  State three ways by which dormancy in seeds can be broken.
(c) State six advantages of using contraceptives in human populations.

Waec Biology past questions objective questions

• A. a parasite
• B. an epiphyte
• C. a saprophyte
• D. a predator
• E. a hermaphrodite

Correct Answer: Option B

2. Given the equation:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ {Under sunlight & Chlorophyll)