BIOLOGY PAPER 3 (231/3) 2006 PRACTICAL QUESTIONS

BIOLOGY PAPER 3 (231/3) 2006

PRACTICAL QUESTIONS

1. The photographs below are bones obtained from the same region of a mammalian body. Photograph labeled K are different views but same bone while M and N are views of different bones.

(a) Name the region from which the bones were obtained (1 mark)

(b) Identify the bones (3 marks)

K…………………………………………………………………..

M…………………………………………………………………

N………………………………………………………………….

(c) State three characteristic features of the bone in photographs labeled K (3 marks)

(d) Name the structure that fits in the opening labeled P in the photograph of bone K (2 marks)

(e) State the functions of the parts labeled S and T in photographs of bone K (2 marks)

(f) Name the structures that articulate with the parts labeled V in the photographs of bone K (1 mark)

(g) Name the parts labeled U and Y in the photograph of bone M and R in the photograph of bone N (3 marks)

2. You are provided with two pieces of plant material labeled specimen D. Using a scalpel, cut a slit halfway through the middle of each piece shown in the diagram below.

Place one piece in the solution labeled L₁ and the other in solution labeled L₂. Allow the setup to stand for 30 minutes.

(a) After 30 minutes remove the pieces and press each gently between the fingers

(i) Record your observations

L₁………………………………………………………. (1 mark)

L₂………………………………………………………. (1 mark)

(b) Examine the pieces

i) Record other observations beside those made in (a)(i) above (3 marks)

ii) Account for the observations in (a)(i) above (5 marks)

iii) Account for the observation in (b)(i) above (2 marks)

3. You are provided with three sets of seedlings labeled A, B and C. Examine them.

(a) State the conditions under which each set was grown (3 marks)

(b) State four differences between the seedlings in set A and B (4 marks)

(c) (i) Name the phenomenon exhibited by seedling in set B (1 mark)

(ii) Give a reason why plants exhibit the phenomenon named in (c)(i) above (1 mark)

(d) Name the response exhibited by the seedling in set C (1 mark)

(e) Explain how the response named in (d) above occurred (3 marks)