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Borabu Masaba District Mock-Biology Paper 2 Question Paper
Borabu Masaba District Mock-Biology Paper 2
Course:Secondary Level
Institution: Mock question papers
Exam Year:2012
NAME:……………………………………………………… INDEX NO:…………………………
SCHOOL:………………………………………………….. DATE:……………………………….
SIGN:………………………………..
231/2
BIOLOGY
PAPER 2
(THEORY)
JULY/AUGUST - 2012
TIME: 2 HOURS
BORABU-MASABA DISTRICTS JOINT EVALUATION TEST– 2012
Kenya Certificate of Secondary Education (K.C.S.E)
231/2
BIOLOGY
PAPER 2
(THEORY)
JULY/AUGUST - 2012
TIME: 2 HOURS
Answer ALL questions in this section in the spaces provided.
1. The diagram below illustrates and experiment to determine the rate of respiration in a small insect.
a) Name the chemical compound labelled X and state its function. (2mks)
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b) Why is it necessary to place the flask in a water bath. (3mks)
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c) What changes would you expect to observe in the level of coloured water in the capillary tube after the experiment has run for five minutes. (1mk)
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d) Explain the changes you have started in ( c) above. (3mks)
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e) State how you can set up a control experiment . (1mk)
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2. The diagram below represents a plant cell organelle
a) Name the organelle. (1mk)
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b) In which of the labelled parts does carbon (IV) Oxide fixation occur? (1mk)
c) Name the parts labelled A and B and state how each is adapted to its functions. (4mks)
A.................................................................................................................................................................................................................................................................................................
B.................................................................................................................................................................................................................................................................................................
d) Explain what would have happened to the structures labelled X had the plant been kept in darkness for 48 hours. (2mks)
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3. The diagram below shows a cross section through the female part of a flower.
a) Name the structures labelled W,X, and Y. (3mks)
. X .....................................................................
Y .......................................................................
Z .......................................................................
b) State two functions of the pollen tube. (2mks)
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c) What happens to antipodal cells after fertilization. (1mk) ............................................................................................................................................................. .............................................................................................................................................................
d) Name the structure labelled K and state their role. (2mks)
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4. a) Name any three defects of the circulatory system in humans. (3mks)
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b) How are leucocytes adapted to their function. (2mks)
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c) Name the blood vessel with the highest ionic extraction of
i) Glucose (1mk)
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ii) Carbon (IV) Oxide. (1mk)
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d) What is the importance of tissue fluid. (1mk)
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5. Below is a pedigree chart showing the incidences of colour blindness trait linked to the X – chromosome transmitted through a recessive gene. Study the diagram and answer the following questions.
a) Gives the genotypes of person 1 and 2
1 ....................................................................
2 ...............................................................................
b) Explain why there are no male carriers for this conduction. (1mk)
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6. Explain why there are more colour blind male than female in a population. (3mks)
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SECTION B( 40 MARKS)
Answer questions 6 ( compulsory)and either questions 7 or 8 in the spaces provided questions 8
7. The glucose level in mg per 100cm3 of blood was determined in two person Y and Z. Both had stayed for six hours without taking food. They were fed on equal amount of glucose at the start of the experiment .The amount of glucose in their blood was determined at intervals .The results are shown in the table below.
Times in minutes Glucose level in blood in mg /100cm3
Y Z
0 85 78
20 105 110
30 105 110
45 130 170
60 100 195
80 93 190
100 90 140
120 90 130
140 88 120
a) On the grid provided, plot graphs of glucose levels in blood against time on the same axes.
(7mks)
b) What was the concentration of glucose in the blood of Y and Z at the 50th minute? (2mks)
Y .........................................................................
Z ..........................................................................
c) Account for the level of glucose in present Y
i) During the first 45 minutes. (2mks)
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ii) After 45th minute to the end. (4mks)
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d) Account for the decrease in glucose level person Z after 60 minutes. (2mks)
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e) Low blood sugar level in harmful to the body .Explain. (3mks)
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7. a) What assumption are made when using the captured recapture method in estimating
population of animals. (5mks)
b) Describe how you would use the capture – recapture method to estimate the population of fish in the school pond. (15mks)
8. Describe the structure and function of the various parts of the mammalian brain. (20mks)
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