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231/3 Biology Question Paper
231/3 Biology
Course:Biology
Institution: Form 4 Mock question papers
Exam Year:2010
NAME………………………………………………INDEX NO……………………..
SCHOOL……………………………………………………………………………….
CANDIDATES SIGNATURE………………….
DATE…………………………………………….
231/3
BIOLOGY
PAPER 3
PRACTICAL
JULY/AUGUST 2010
2 HOURS
FORM FOUR LAICOMET 2010
231/3
BIOLOGY
PAPER 3
INSTRUCTION TO CANDIDATES:
- Write your name and index number in the spaces provided at the top of this page. Sign and write the date of examination in the spaces provided
- Answer all questions.
- You are required to spend the first 15 minutes of 2 hours allowed for this paper reading the whole paper carefully before commencing your work
- Answers must be written in spaces provided
- Additional pages must not be inserted
FOR EXAMINERS USE ONLY
QUESTION MAX SCORE CANDIDATE’S SCORE
1 14
2 16
3 10
TOTAL 40
1. (a) You are provided with specimens labeled X and Z and some reagents. Perform food tests to identify the foods present in the specimens
SPECIMEN X
FOOD SUBSTANCE PROCEDURE OBSERVATION CONCLUSION
(4 mks)
SPECIMEN Z
FOOD SUBSTANCE PROCEDURE OBSERVATION CONLUSION
(4 mks)
b) Suggest how you would combine the two specimens to improve the quality of the specimen Z to make it a better food for human consumption (2mks)
…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
c) (i) Suggest the type of deficiency disease a child would suffer from if it was fed on specimen X only (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………
(ii) Suggest a remedy for the deficiency (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. Below are diagrams of specimens that were observed by a student during an ecological study
a) Identify the classes into which specimens F, G, H and I belong. Give reasons for your answers
specimen class reason
F
G
H
I
(4mks)
b) Identify one observation characteristic which makes the organisms E, G, I and J survive better in their environments.
Give a reason in each case
Specimen characteristic reason
E
G
I
J
(4mks)
c) The following is a dichotomous key which the students constructed to identify the organisms F, G, H, I. Use the key to identify the class for organisms. Write the steps followed in each case
1. a) Animals with wings…………………………………………………..go to 2
b) Animals without wings……………………………………………….go to 3
2. a) Animals with one pair of wings………………………………………INSECTA
b) Animals with two pairs of wings…………………………………HYMENOPTERA
3. a) Animals with two body parts…………………………………………go to 4
b) Animals with several body parts ……………………………………Diplopoda
4. a) Animals with chelicera …………………………………………….CRUSTACEA
b) Animals without chelicera…………………………………………...ARACHNIDA
Organism steps followed identity
F ………………………… ……………………..
G ………………………….. ……………………...
H …………………………… ……………………...
I …………………………… ………………………
3. The diagrams below represent body parts of some organisms (animals). Study them and answer the question that follow
a) (i) Suggest the type of food eaten by organisms with the parts labeled A, B, C and F
Food Reason
A
B
C
F (4mks)
(ii) With reasons, suggest the likely habitat of the organism from which the parts labeled D and E were obtained
Part Habitat Reason
D
E
(4mks)
b) (i) Suggest the type of evolution that is exemplified by the organisms labeled D, E and
F. Give reason for your answer
The type of evolution (2mks)
…………………………………………………………………………………………..
Reason
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
(ii) Suggest the significance of the above named type of evolution for the organism (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
b) (i) Explain briefly the meaning of analogous structures (1mk)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
(ii) Give one example of analogous structure (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
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