(a) (i) What is a mixture?
(ii) Explain why some mixtures are thoroughly stirred before they are used.

(b) (i) What is reflection of light?
(ii) State two characteristics of the images formed by plane mirrors

(c) (i) What is a fertilizer?
(ii) Give one example of an inorganic fertilizer

(d) (i) What is indiscriminate sex?
(ii) State two dangers of indiscriminate sex on humans