(a) (i) What is a transistor?
(ii) Give two uses of a transistor

(b) Mention the suitable solvent for each of the following solutes:
(i) grease;
(ii) ink stain
(iii) starch
(iv) cube
(v) sugar
(vi) oil
(vii) paint
(viii) iodine

(c) (i) What is a respiratory organ?
(ii) Name two structures of the respiratory system of humans.

(d) (i) What is agricultural chain?
(ii) Name two types of agricultural chain