WAEC Biology Past Questions and Answers

Choose the correct definition of 'Brain'.

• A A structure made up of different tissues working together to perform a function
• B The organ that controls thought, memory, and coordinates body activities
• C The part of the earth where living organisms exist
• D A specialised structure within a cell that performs a specific function

A student crosses a person showing the presence of dimples (genotype DD) with a person showing the presence of dimples (genotype DD), given that the presence of dimples (D) is dominant over the absence of dimples (d) for dimples. What is the expected phenotypic ratio of the offspring?

• A 1 the presence of dimples : 1 the absence of dimples
• B 3 the presence of dimples : 1 the absence of dimples
• C All offspring show the the absence of dimples phenotype
• D All offspring show the the presence of dimples phenotype

Identify the term defined as: 'A tiny structure produced by the anther that contains the male sex cells of a plant'

• A Flower
• B Pollen grain
• C Offspring
• D Excretion

In guinea pigs, the inheritance of coat texture follows a single-gene (Mendelian) pattern, where rough coat (H) is dominant over smooth coat (h). A homozygous dominant individual showing rough coat (HH) is crossed with a homozygous recessive individual showing smooth coat (hh). What fraction of the offspring is expected to have the genotype HH?

• A 0 (none of the offspring)
• B 1 (all of the offspring)
• C 1/2
• D 1/4

In pea plants, the inheritance of pod shape follows a single-gene (Mendelian) pattern, where inflated pods (N) is dominant over constricted pods (n). A heterozygous individual showing inflated pods (Nn) is crossed with a homozygous dominant individual showing inflated pods (NN). What is the expected phenotypic ratio of the offspring?

• A All offspring show the constricted pods phenotype
• B 3 inflated pods : 1 constricted pods
• C 1 inflated pods : 1 constricted pods
• D All offspring show the inflated pods phenotype

Choose the correct definition of 'Chloroplast'.

• A The movement of blood around the body carrying substances to and from cells
• B The part of a plant that develops from the ovary after fertilisation and contains seeds
• C The organelle in plant cells where photosynthesis takes place
• D The thin outer layer that controls the movement of substances into and out of a cell

Identify the term defined as: 'The process by which green plants make their own food using sunlight, carbon dioxide and water'

• A Amphibian
• B Saliva
• C Photosynthesis
• D Skeleton

In guinea pigs, the inheritance of coat colour follows a single-gene (Mendelian) pattern, where black coat (C) is dominant over white coat (c). A heterozygous individual showing black coat (Cc) is crossed with a homozygous recessive individual showing white coat (cc). What is the expected phenotypic ratio of the offspring?

• A 1 black coat : 1 white coat
• B 3 black coat : 1 white coat
• C All offspring show the black coat phenotype
• D All offspring show the white coat phenotype