KCSE Past Papers 2018 Biology Paper 3 (231/3)

2018 Biology Paper 3

Answer all the questions in the spaces provided.

1. The photographs below represent three mammalian bones, labelled E, F and G.

E F G

(a) With reasons, identify the bones.

Identity

Bone E……….

Identity

Bone F……….

Identity

Bone G……….

(b) Name the joints formed at the anterior and posterior ends of F. Anterior end (1 mark)

Posterior end …………………..,. (1 mark)

(c) State the types of movement facilitated by the joint at the anterior end of specimen labelled F. (1 mark)

(d) (i) Name the substance found inside the living tissue of the specimen represented in photograph F. (1 mark)

(ii) State the fiinction of the substance named in (d) (i) above.

(e) (i) Name the muscle bundle usually attached onto the front of the specimen represented in photograph F.

(ii) State the function of the muscle bundle named in (e) (i) above.

2. Below is a photograph of a blood smear from a normal individual. The arrangement is arbitrary and the number of blood elements is greater than what would normally occur in an actual microscopic field.

(a) (i) Name the blood elements labelled J, K and L. (3 marks)

J………

K……….

L……….

(ii) State one function of each of the elements named in (a) (i) above. (3 marks)

K ………………

L ……………….

5 (b) The photograph below is of a section of the human intestines of a patient suffering from a common parasitic disease.

(i) Name the disease.(1 mark)

(ii) Name the parasite that causes the disease in (b) (i) above.(1 mark)

(iii) State Evo control measures for the disease.(2 mark)

(iv) State the effects of having the parts labelled G in the patient’s intestines.

3. You are provided with a specimen labelled H. With the aid of a hand lens, examine the external features of the specimen.

(a) (i) What part of a plant is specimen H?

(ii) Give two reasons for your answer in (a) (i) above.

(b) Open up specimen H longitudinally.

Use a hand lens to observe the internal structures of specimen H. (1 mark)

(i) Draw and label the internal cut surface and associated structures of specimen H. (5 marks)

(ii) Explain how you would determine the magnification of the drawing made in (b) (i) above. (2 marks)

(iii) State the mode of dispersal for seeds of specimen H.(I mark)

(iv) Explain how seeds of specimen H are dispersed through the mode stated in (b) (iii) above. (3 marks)

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