NAME……………………………..………..ADM NO……………………SIGN………………….
INDEX NO………………………………………..STREAM…………………….
231/3
BIOLOGY PAPER 3
(Theory)
Time: 1 hours 45 minutes
MOKASA II JOINT EVALUTION EXAMINATION
Kenya Certificate of Secondary Education
- Write your name, Index Number in the spaces provided above.
- Write the date of examination in the space provided above.
- Answer ALL the questions in the spaces provided below each question in the question paper.
FOR EXAMINER’S USE ONLY
| Question | Maximum score | Candidate’s score |
| 1 | 13 | |
| 2 | 13 | |
| 3 | 14 | |
| TOTAL | 40 |
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- Solution A and B are mammalian excretory products. They are similar except they were obtained from two different animals ;A and B of the same species. This is the main nitrogenous waste in mammals
Use the two samples A and B to carry out the following experiment and hence record your findings.
Using the reagents provided,Carry out the appropriate food tests on sample A and B and hence complete the table below.(6mks)
| TEST | PROCEDURE | SAMPLE A | SAMPLE B | ||
| OBSERVATION | CONCLUSION | OBSERVATION | CONCLUSION | ||
| Glucose
|
|
||||
| Protein
|
|
||||
(b) With reference to the results suggest the animal that is unhealthy. (1mk)
- c) For the unhealthy (sick) animal identified in (b) above, name the disease its suffering from. (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
- d) Explain the cause of the disease identified in (c) above. (2mk)
- e) State how the disease in (c) above can be treated. (1mk)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..
(f) Other than excretory wastes in A and B, name any other nitrogenous excretory wastes in animals and give an example of an animal that excretes it. (2mks)
…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..
- Observe the photographs below and answer the questions that follow.
- a) Name the feeding relationship illustrated in Photograph:
T…………………………………………………………………………… (1MK)
Y……………………………………………………………………………. (1mk)
- b) With reasons identify the phylum and the kingdom to which organism S belongs
| Kingdom | Phylum | |
| Classification | ||
| Reason |
|
- c) State two observable roles of organism P to an ecosystem in photograph T (2MK)
…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
- d) State the significance of the behavior pattern illustrated by
- I) Organism in photograph U (IMK)
……………………………………………………………………………………………………………………
- II) Organism in photograph Z (1mk)
…………………………………………………………………………………………………………………..
- e) Organism S and organism Z initially belonged to the same species but with time they have speciated to two distint species. Explain the mechanism that has led to their speciation (2mks)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
- f) Explain why we can only have a limited number of tropic levels in a natural ecosystem (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….
- Below are photographs of mammalian bones J, R, A and B from the same animal.
- With reasons identify the following bones. (4mk)
| BONE | REASON |
| J- | |
| R- |
- Onto which of the labelled parts on J does structure 1 and 2 on bone R articulate. (2mk)
- 1 articulates with. ……………………………………….
- 2 articulates with. ……………………………………….
- Make a drawing to show how bones J and bone R articulate (3mk)
- Name the bone that articulates with Bone A at the proximal and name the type of joint formed. (2mks)
| BONE | TYPE OF JOINT |
- Name the region from which bone B was obtained. (1mk)
………………………………………………………………………………………………………………………………………………
- State two ways in which bone B is structurally adapted to perform its functions. (2mk)
……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..
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