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K.C.S.E 2007 Biology Paper 3 Practical Questions Question Paper

K.C.S.E 2007 Biology Paper 3 Practical Questions

Course:Secondary Level

Exam Year:2007

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.
.
104
(a) Using observable features in the photographs. Complete the dichotomous key
given below
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
(b) 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.
(a) 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)
.
105
Solutions S is Benedict’s solution
(b) 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

K.C.S.E 2007 Biology Paper 3 Practical Questions Question Paper

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