1. What is a food chain?

2. Why is the plant in any food chain referred to as producer?

3. What is the term given to the other organisms that depend directly or indirectly on the producer for food?

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 carefully and answer the questions that follow.

1. Name each of the shadows that is cast on the screen:

   α) A;

   β) B.

2. What does the shadow of the object cast on the screen illustrate?

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

State three ways by which soil can be conserved.

A body of mass 100kg is raised to a height of 2m above the ground.

1. State the name of the energy possessed by the object by reason of the new position.

2. Calculate the value of this energy. [g=10 m/s²]

1. What is matter?

2. State two of the states of matter.

1. Describe the nature of a loamy soil.

2. Name any two plant nutrients.

1. State the causative organism for each of the following diseases:

   α) cholera;

   β) tuberculosis.

2. State one method of prevention of cholera.

Explain briefly why a tomato plant is likely to wilt if too much fertilizer is applied.

State the dangers involved in each of the following activities in the laboratory:

1. eating or drinking water in the laboratory;

2. walking barefooted;

3. washing hands with unknown liquid in a beaker.

A child is found not to be able to see at night.

1. What deficiency disease may the child be suffering from?

2. What food nutrient is the child lacking?

3. State three sources of food substances that can provide the nutrient that the child lacks.

1. What is a force?

2. Explain briefly why a driver could not stop a car on a slippery section of a road when he applied the brake.

Describe briefly how the volume of an irregular shaped lead ball could be measured.

State three characteristics of living things.

1. What is pollution?

2. Name one air pollutant.

State three factors which influence vegetable crop production.

State three ways in which crop rotation is important in crop production.

State three properties of the image formed by a plane mirror.

1. What is photosynthesis?

2. Explain briefly why a digestive system is necessary in humans.

1. Give the systematic name of the following compounds:

   α) MgCl₂;

   β) FeS.

2. What is an element?

3. What is the name given to a solid mixture?