A man with blood group a is married to a woman with blood group A. Which of the following group combinations is possible if the family has three children?

A. B, A, AB

B. O, A, B

C. B, AB, AB

D. A, O, A

The F₁ of a cross between a tall and a dwarf plant was tall. The F₁ was advanced to F₂. How many of 120F₂ plants will be dwarf?

A. 30

B. 60

C. 90

D. 120

All the sons of a colour-blind woman will be coloured blind regardless of the state of the father because

A. the egg determines the phenotype of the son

B. sons inherit the sex chromosome of their mothers

C. the father's sex chromosomes is weaker in sons

D. sex-linked traits express dominance in females

The slender, long and slightly curved beak of the sun-bird is an adaptation for breeding for feeding on

A. nectar

B. small seeds

C. big seeds

D. insects

Scales on reptiles are a feature for

A. conserving water

B. conserving food

C. protecting the skin

D. locomotion

The colour of the ventral surface of a fish is lighter than that of the dorsal. This is mainly

A. an adaptation for movement

B. an adaptation for camouflage

C. for attracting mates

D. for regulating body temperature

The least evidence in support of the theory of evolution is provided by the study of

A. anatomy

B. ecology

C. geology

D. embryology

From which group of animals are the mammals generally believed to have most recently evolved?

A. Reptiles

B. Fish

C. Amphibians

D. Birds

The diagram represents

A. sensory neurone

B. relay neurone

C. afferent neurone

D. motor neurone

The part labelled X is the

A. axon

B. cell body

C. terminal dendrites

D. synapse