The deficiency of vitamin C causes:

What is a balanced diet, and name the six classes of food it should contain.

Name three minerals needed by the body, a source of each and the deficiency it causes.

State the functions of proteins and of fats in the body.

Name the deficiency disease caused by a lack of vitamin A, vitamin C and vitamin D, and one source of each vitamin.

What is roughage? Name two sources and state why it is needed.

Define pollination and distinguish between self-pollination and cross-pollination.