Fig. 1(a) is an illustration of the longitudinal section of the mammalian heart.

Study it carefully and answer the questions that follow.

1. State one function for each of the parts labelled I, II, IX, and X.

2. Explain briefly why the left lower part of the heart has a thicker muscle.

3. State two ways by which the flow of blood to and from the mammalian heart as shown in Fig 1(a) can be kept at acceptable levels.

4. Name two parts of the heart where oxygenated blood can be found.

Fig. 1(b) is an illustration of three sets of plant parts labelled P(maize grains), Q(tomato seedlings) and R(cassava cutting).

Study it carefully and answer the questions that follow.

1. Describe briefly how each of the parts labelled P, Q, and R are planted on a seedbed.

2. State four conditions under which R can be cultivated to produce a high yield.

Fig. 1(c) is an electric circuit diagram

Study it carefully and answer the questions that follow.

1. State one function for each of the parts labelled I, II, III, and IV.

2. If the voltmeter reads 2.4 V and the ammeter reads 0.8 A when the circuit is closed, calculate the value of the part labelled IV.

3. State one way of conserving the value of the part labelled I in the circuit.

4. State two observations that can be made when the circuit is closed.

Fig. 1(d) illustrates an experiment performed to separate the components of a mixture.

Study it carefully and answer the questions that follow.

1. Describe briefly the process of this experiment.

2. State one function for each of the parts labelled II and IV.

3. State two precautions that should be taken to obtain reliable results when performing this experiment.