(a) (i) What is an alloy?
(ii) State two causes of corrosion of metals.

(b) (i) What is a planet?
(ii) Name two planets between the Sun and the Earth.

(c) State four functions of the circulatory system in humans.

(d) (i) Define the term crop rotation.
(ii) Give one example of a chemical method of controlling pests on crop farms.