(a) What are
(i) annual plants?
(ii) perennial plants?

(b) Mention one danger involved in each of the following activities in the laboratory:
(i) eating or drinking water in the laboratory;
(ii) washing hands with unknown liquid in a beaker;
(iii) walking barefooted.

(c) (i) What is a digestive enzyme?
(ii) Give two examples of digestive enzymes in humans.

(d) Give two differences between conduction and radiation