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Biology Paper 2 Question Paper

Biology Paper 2

Course:Secondary Level

Exam Year:2011

NAME ……………………………………..………………..DATE………………………….

INDEX NO. …………….……….……..…..…

CANDIDATE’S SIGNATURE …………..…..………..

231/2
BIOLOGY
PAPER 2
(THEORY)
TIME : 1½ HOURS.
JULY/AUGUST 2011

FORM FOUR CLUSTER EXAMINATION 2011
Kenya Certificate of Secondary Education.
231/2
BIOLOGY
PAPER 2
(THEORY)
TIME: 1½ HOURS.

INSTRUCTIONS TO CANDIDATES
o Write your name and index number in spaces provided above.
o Sign and write the date.
o This paper consists of two sections; A and B. Answer ALL the questions in section A in the spaces
provided.
o In section B answer Question 7 (compulsory) and either question 8 or 9 in the spaces provided.
o Additional pages must not be inserted.

FOR EXAMINER’S USE ONLY
QUESTION MAXIMUM SCORE CANDIDATE’S SCORE
1 5
2 8
3 6
4 8
5 8
6 5
7 20
8 20
9 20
TOTAL SCORE 80

This paper consists of 10 printed pages.
Candidates should check to ensure that all pages are printed as indicated and no questions are missing

© 2010, Mbooni West District Joint Evaluation Test
SECTION A: (40 MARKS)
Answer all the questions in this section
1. (a) Apart from avoiding overcrowding give two other benefits of seed dispersal. 1 mark
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(b) State two ways through which overcrowding disadvantages plants process of photosynthesis. 2 marks
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(c) List two mineral elements necessary for chlorophyll formation. 2 marks
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2. A woman whose blood group is O gives birth to a son whose blood group is A and a daughter whose blood group is B

a. (i) State the possible genotype of the father. 1 mark
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(ii) Using a punnet square work out the genotypes of the offsprings. 3 marks

b. (i) If the mother is rhesus positive and the father is rhesus negative what condition is the child
likely to develop? 1 mark
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(ii) How can the condition be controlled? 1 mark
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c. Explain why the second born child is at risk of death that the first born child if no precaution is taken 2 marks
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3. The equation below shows a chemical reaction that takes place in green plants under certain conditions.
Carbon (IV) oxide + Water Glucose + X
(a) What is the name of substance X ? 1 mark
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(b) Other than the reagents, state two conditions necessary for this reaction 2 marks
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(c) Name two types of cells in which this process occurs 2 marks
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(d) Name the process represented by the equation given above 1 mark
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4. The table below gives information about an aquarium community which is ecologically balanced;
Type of organism Weight in grammes
Insect larva
Fishes
Water plants
Bacteria 500gms
1200gms
5000gms
10gms

a. What do you understand by the term ecological balance? 1 mark
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b. Calculate the total biomass of the aquarium. 2 marks
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c. Which organism in the table is
(i) Primary producer?
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(ii) Secondary consumer? 2 marks
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d. Construct a food web of the aquarium 3 marks

5. The diagram below represents a process in a given special of organisms;

(a) (i) Name the organism. 1 mark
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(ii) Identify the process that is shown to be taking place. 1 mark
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(iii) State the economic importance of organisms found in the kingdom which the organisms shown
above belong. 2 marks
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(b) (i) Define the term species. 2 marks
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(ii) State two principals of binomial nomenclature. 2 marks
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6. The temperature of a person was taken before, during and after taking a cold bath. The results are as shown in the graph below.

(a) Explain why the temperature fell during bath. 2 marks
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(b) What changes occurred in the skin that enabled the body temperature to return to normal.
3 marks
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SECTION B. (40 MARKS)
Question 7 is compulsory.
Choose either question 8 or 9 and answer them in the spaces provided
7. In an experiment to investigate a certain process in a given plant species, the rate of carbon (IV) oxide consumption and the rate of carbon (IV) oxide released were measured over a period of time of the day. The results of the investigation are shown in the table below.

Time of day (hrs) 6 8 10 12 14 16 18 20 22 24
Co2 consumption mm3/min 0 43 69 91 91 50 18 0 0 0
Co2 release mm3/min 38 22 10 3 3 6 31 48 48 48

(a) On the same axis on the grid provided plot graphs of volume of Co2 consumed and released against time 7 marks

(b) Name the biochemical process represented by
a. CO2 consumption 1 mark
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b. CO2 release 1 mark
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(c) Account for the shape of the curve for
a. CO2 consumption 3 marks
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b. CO2 release 3 marks
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(d) (i) From the graph state the time of the day when the plant attains the compensation point. 1 mark
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(ii) What is meant by compensation point? 2 marks
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(e) Explain how temperature affects the rate of CO2 consumption in a plant. 2 marks
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8. Explain the different evidences of evolution 20 marks
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9. Describe the adaptations of the ileum to its function 20 marks
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Biology Paper 2 Question Paper

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