State three external features of the weaver birds that adapt to live successfully in its environment.

List four harmful effects of air pollution.

1. Draw the magnetic lines of force around a bar magnet.

2. If the work input of a machine is 30 joules, what would be its efficiency when the work output is 25 joules?

Outline three principles involved in vegetable crop production.

1. State two differences between an ecosystem and a habitat.

2. What is meant by the term blood?

Explain why it is difficult to separate iron and sulphur mixture after strong heating.

Draw and label a diagram of a ray of light which makes an angle of 35° with the surface of a plane mirror.

1. State two advantages of land rotation.

2. State two disadvantages of land rotation.

1. State one symptom of cerebrospinal meningitis.

2. State one symptom of chicken pox.

3. State one symptom of typhoid.

1. What is energy?

2. Give two reasons why it is necessary to conserve energy.

1. State two methods of restoring soil resources.

2. Explain briefly one of the methods stated in (c)(i).

1. What is a binary compound?

2. Write the chemical formula of the compound formed between:

   (α) Oxygen and lithium

   (β) Magnesium and Chlorine

3. Name the compound formed in (ii)(α).

1. State two uses of water in agriculture.

2. Name two crops that are deep rooted.

1. Explain the term circulatory system in humans.

2. Classify each of the following processes as diffusion or osmosis:

   (α) absorption of water by the roots of a plant

   (β) movement of digested food from the small intestine into the blood stream

1. What is mass?

2. A box of equal size 3 cm has a density of 2.0 g/cm³. What is its mass?

1. Give the state of each of the following substances:

   (α) ash;

   (β) carbon dioxide.

State three functions of the female reproductive system in humans.

1. What is the role of a capacitor in a circuit?

2. Give two examples of a compound machine.

1. What is Integrated Pest Management?

2. State two advantages of practicing integrated pest management.

1. State two classes of mixtures.

2. Classify each of the following substances under the classes stated in (i):

   (α) bronze;

   (β) when perfume is sprayed into the air.