Name the two elements that combine to form water.

Write a balanced chemical equation to show how the water is formed from the named elements.

State two ways of maintaining a balance in an ecosystem.

1. What is a fertile soil?

2. State two factors that cause loss of soil fertility.

Classify the following items as magnetic or non-magnetic substance: wood, steel blade, rubber, and glass jar.

1. What is germination of seed?

2. State two conditions necessary for the germination of seed.

State four methods used in identifying farm animals.

Explain why it is easier to cut a piece of yam with a sharp knife than with a blunt knife.

State three differences between a metal and a non-metal.

1. What is debeaking?

2. Give two reasons why debeaking in poultry birds is important.

1. A steel needle carefully placed on the surface of water floats. What type of force made the steel needle to float?

2. Name three substances that could be added to the water to make the steel needle sink.

1. Explain why gold is preferred to iron in the making of jewelleries.

2. State one way of preventing rusting.

1. State two elements of climate.

2. Name the equipment used to measure each of the elements stated in (i) above.

1. What is refraction of light?

2. Sketch a diagram to show the path of a light ray when it travels from air to glass.

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

1. Give two examples of digestive enzymes produced in humans.

2. For each of the enzymes given in (i), name the part of the human body where the enzyme is produced.

List four methods of applying fertilizers to crops.

Consider the substances listed below: carbon dioxide, gold, bronze, iron, oxygen, and ink. From the list, select the substance that:

1. supports burning;

2. is used as jewellery;

3. is used for making statues.

1. Name two diseases associated with the circulatory system of humans.

2. State one way of preventing each of the diseases named in (i).

Give two examples of each of:

1. major plant nutrients;

2. minor plant nutrients.

1. State two properties of a good thermometric liquid.

2. Give two examples of a good thermometric liquid.