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K.C.S.E 2007 BIOLOGY PAPER 3
PRACTICAL QUESTIONS
1. Below are photographs labeled P,Q,R,S,T,U and V of twigs obtained from plants examine them.
1 a Simple leaves go to 2
b Compound leaves go to 5
2 a Leaves net veined go to 3
b leaves parallel- veined commerlinaceae
3 a……………………………….. go to 4
b leaves with smooth margin Nyctsginaceae
4 a Leaves alternate Malvaceae
b ……………………………… Verbenaceae
5 a………………………………. go to 6
b leaves bipinnate Bignoniaceae
6 a leaflet with serrated margin Compositae
b leaflets with smooth margin Papilioceae
- Use the completed dichotomous key to identify the family tow hich each plant belongs
In each case show the steps you followed to arrive at the identity. ( 12 marks)
Identity Steps Followed
P
Q
R
S
T
U
V
2. You are provided with solutions labeled P,Q,S and a filter paper. The solution labeled P will be used in parts (a), (b) and (c).
Solution Q is iodine solution.
- Use the iodine solution to test for the presence of food substance in solution P.
Food substance ( 1 mark)
Procedure ( 1 mark)
Observation ( 1 mark)
Conclusion ( 1 mark)
Solutions S is Benedict’s solution
- Use the benedict’s solution to test for the presence of the food substance is solution P.
Food substance ( 1mark)
Procedure ( 2 marks)
Observation ( 1mark)
Conclusion ( 1 mark)
(c) Using the filter paper provided. Test for the presence of liquids in solutions
P.
Procedure ( 2 marks)
Observation ( 1mark)
Conclusion ( 1 mark)
3. Below are photographs labeled J and K of organs obtained from different animals. The organs perform similar functions. Examine them.
(a) Identify the organs ( 2 marks)
J
K
(b) State the functions performed by the organs ( 1 mark)
(c) Name the parts labeled X. Y and Z in photographs ( 3 marks)
X
Y
Z
(d) (i) Identify the parts labeled 1, 2 and 3 in photographs K ( 3 marks)
1.
2.
3.
(ii) Using observable features. State how the parts labeled 1 and 3 you identified in (d)(i) above are adapted to their function ( 4 mark)
1
2.
3
