(a) (i) What is food chain?
(ii) Why is the plant in any food chain referred to as the producer?
(iii) What is the term given to the other organisms that depend directly or
indirectly on the producers for food.

(b) The diagram below is an illustration of the picture obtained on a screen when an opaque object is placed in the path of a light source.
Study the diagram and answer the questions that follow.
INSERT i2019b2b

(i) Name each of the shadows that is cast on the screen;
(α) A;
(β) B

(ii) What does the shadow of the object cast on the screen illustrate?

(c) Describe briefly how a sample of pure sugar could be obtained from a mixture of sugar and sand.

(d) State three ways by which soil can be conserved.