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Biology Practical Paper 3 Question Paper

Biology Practical Paper 3

Course:Secondary Level

Exam Year:2010

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Name……………………………………………………………. Index No……………………………..
School…………………………………………………………… Candidate’s sign…………………….
Date………………………………….
231/3
BIOLOGY
PRACTICAL
PAPER 3
JULY / AUGUST 2010
Time: 1 ¾ Hours
NYAHURURU DISTRICT JOINT EVALUATION TEST – 2010
Kenya Certificate of Secondary Education (K.C.S.E)
231/3
BIOLOGY
PRACTICAL
PAPER 3
JULY / AUGUST 2010
Time: 1 ¾ Hours
INSTRUCTIONS TO CANDIDATES
1. Write your name and Index number in the spaces provided at the top of this page
2. Sign and write the date of examination
3. Answer all questions
4. You are required to spend the first 15 minutes of 1 ¾ hrs allowed for this paper reading the whole
paper carefully before commencing your work.
5. Answers must be written in the spaces provided in the question paper
6. Additional pages must not be inserted.
FOR EXAMINERS USE ONLY
QUESTION MAXIMUM SCORE CANDIDATE’SCORE
1 10
2 15
3 15
TOTAL 40
This paper consists of 8 printed pages.
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Candidates should check the question paper to ensure that all pages are printed as indicated
and no questions are missing
1. You are provided with a suspension labelled M.
a) Using the reagents provided only, test for the food substances present in the suspension.
In the table below, record the food tested, procedure, observation and conclusions.
Food substance Procedure Observation Conclusion
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b) Name an enzyme that may be required to digest suspension M in the alimentary canal
in human. (1mk)
………………………………………………………………………………………………………
c) State role of sodium hydrogen carbonate in the experiment. (1mk)
………………………………………………………………………………………………………
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2. a)
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The diagram above shows two parts of two different cells which were observed during
photomicrograph study.
(a) With two reasons in each case state what part (A or B) was obtained from:
(i) A plant (1mk)
………………………………………………………………………………………………………
Reason (1mk)
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………………………………………………………………………………………………………
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(ii) An animal (1mk)
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Reason (1mk)
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b) Name the parts labelled C,D, N and W. (2mks)
C ………………………………………………………………
D ………………………………………………………………
N ………………………………………………………………
W ………………………………………………………………
c) What is the biological significance of the organelle labelled R in part b. (2mks)
………………………………………………………………………………………………………
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d) In a related exercise a student observed the structures below under the microscope.
i) Structure I represent stomata that are fully opened while structure II a fully closed
stomata..
Discuss the photosynthetic theory that Explain the opening and closing of stomata.
(5mks)
…………………………………………………………………………………………
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ii) The magnification for the above structures was X10000. Using the ruler, determine the
actual length from point Y and Z. In micrometers. (2mks)
…………………………………………………………………………………………
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3. Below are drawings of specimens from plants. Study them and answer the questions that follow
a) What is the role of the specimens to the plants. (1mk)
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b) Differentiate the specimen Q from specimen R. ( 4mks)
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c) Label the parts labelled A,B C and D
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C ………………………………………………………………
D ………………………………………………………………
N ………………………………………………………………
W ………………………………………………………………
d) Explain what happens to the floral structures after fertilization. (4mks)
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e) With a reason state the class of plants from which the specimens were obtained. (2mks)
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Biology Practical Paper 3 Question Paper

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