(a) (i) Explain the following terms as applied to machines:
(α) work input;
(β) work output.

(ii) State one factor that limits work output for a given work input in a simple machine.

(b) (i) What is chloroplast?
(ii) Differentiate between aerobic respiration and anaerobic respiration.

(c) (i) State the colour change that would occur when blue litmus paper is dipped into a solution of:
(α) vinegar;
(β) wood ash.

(ii) Name the products formed when hydrochloric acid reacts with sodium hydroxide.

(d) List two benefits of vegetables to humans.