Tranzoia West District Bio Ppr 3 Question Paper

Tranzoia West District Bio Ppr 3

Course:Biology

Exam Year:2008

Name ………………………..………………………… Index No. ..……………………………….….
School ………………………………………………... Candidates signature ……………………… Date………………………………………….

231/1
BIOLOGY
Paper 1
(Theory)
July / August – 2008
Time: 2 Hours

TRANS – NZOIA WEST DISTRICT MOCK EXAMINATION - 2008
Kenya Certificate of Secondary Education (K.C.S.E)

231/1
BIOLOGY
Paper 1
(Theory)
July / August – 2008
Time: 2 Hours

INSTRUCTIONS TO CANDIDATES
• Write your name and index number in the spaces provided above.
• Answer ALL the questions in the spaces provided

FOR EXAMINER’S USE ONLY.

QUESTIONS MAXIMUM SCORE CANDIDATES SCORE
1 – 27 80

This paper consists of 9 printed pages.
Candidates should check the question paper to ensure that all the
Pages are printed as indicated and no questions are missing.
1.a) State the function of granum in chroloplasts. (1 mk)
b) The diagram below represents a cell organelle.

(i) Name the part labeled Y. (1 mk)
(ii) State the function of the part labeled X. (1 mk)

2.Fill in the blank spaces in the statement below
After fertilization of an ovule ……………………………………………………………………….
develops into a testa and …………………………………………………………………………..
develops into an endosperm. (2 mks)

3.State two reasons why the stomach wall cannot be digested by the proteolytic enzymes. (2 mks)
4.Explain how the following adaptations will reduce the rate of transpiration.
a) Sunken stomata (1 mk)
b) Leaf folding (1 mk)

5. a) What makes young herbaceous plant remain upright? (2 mks)
b) Name the tissue in higher plants that is responsible for support. (1 mk)
………………………………………………………………………………………………………. ……………………………………………………………………………………………………….6. The diagram below represents a cross-section through a certain part of a flowering plant.

a) (i) Identify the part of the plant from which the cross-section was made. (1 mk)
(ii) Give a reason for your answer in a) (i) above. (1 mk)
b) State the function of the parts labeled A and B. (2 mks)

7.State two ways in which the ileum is structurally adapted to the absorption of digested food.
(2 mks)

8.When are two organisms considered to belong to the same species? (2 mks)

9.State two physiological changes that take place in a human skin in order to facilitate heat loss from body. (2 mks)

10.Give two reasons why pressure of blood is greater in arteries than in the veins of mammals.
(2 mks)
11.State three importance of osmosis in plants. (3 mks)

12.Distinguish between haemolysis and plasmolysis. (2 mks)

13.Distinguish between natural and acquired immunity. (2 mks)

14.State how the tracheole system in insects is adapted for gaseous exchange. (3 mks)

15.a) Name a protein, vitamin, an enzyme and a mineral element that are involved in blood clotting.
(2 mks)
Protein
Vitamin
Enzyme
Mineral element
b) Name one way by which white blood cells fight micro-organisms. (1 mk)

16.a) What is the meaning of the following terms.
(i) Egestion (1 mk)

(ii) Secretion (1 mk)

(iii) Excretion (1 mk)

b) State the importance of osmo-regulation in organisms. (1 mk)

17.a) Distinguish between niche and habitat (2 mks)

b) Name the composition of a food chain. (2 mks)

18.Oil can be applied on stagnant water to control the spread of malaria
a) How does this practice control the spread of malaria. (1 mk)
b) Give a reasons why this practice should be discouraged. (1 mk)
c) Name the organism that cause cholera. (1 mk)

19.State two ways in which sexual reproduction is important in the evolution of plants and animals. (2 mks)

20.a) State the difference between the composition of maternal blood entering the placenta and maternal blood leaving the placenta. (2 mks)

b) State two advantages of fruit and seed dispersal. (2 mks)

21.a) What is the role of cotyledons to a germinating seed? (2 mks)
b) Name the part of a maize seed that elongates to bring about hypogeal germination. (1 mk)

22.a) What is meant by the term Genome? (1 mk)
b) Part of one strand of DNA molecule was found to have the following sequences.
G – G – C – T – A – C – C – T – A – A – C
What is the sequence of the;
(i) Complementary DNA strand? (1 mk)
(ii) M – RNA strand? (1 mk)
c) What is a back – cross? (1 mk)

23.a) What is meant by
(i) Organic evolution? (1 mk)
(ii) Continental drift? (1 mk)
b) Distinguish between analogous and homologous structures. (2 mks)

24.a) What is the function of a relay neuron? (1 mk)

b) The diagram below represents a neuron junction of a mammal

(i) Name the structures labeled A and B. (2 mks)
(ii) On the diagram indicate the direction of the impulse using an arrow. (1 mk)
(iii) Name the enzyme that destroys the transmitter substance in the synaptic cleft. (1 mk)

25.a) Name the hormone that is responsible for parthenocarpy. (1 mk)
b) What is rheotaxis? (1 mk)

26.The diagram below illustrate a certain eye defect.

a) State the defect. (1 mk)
b) How can the defect be corrected. (1 mk)
c) State two advantages of having two eyes in human beings. (2 mks)

27.a) Name the three types of skeletons found in multicellular animal . (3 mks)
b) State one characteristic of Axis that distinguishes if from other cervical vertebrae. (1 mk)

28.Name two gaseous exchange structures in higher plants. (2 mks)

📘 Access 10,000+ CBC Exams With Marking Schemes

Tranzoia West District Bio Ppr 3 Question Paper

More Question Papers

Exams With Marking Schemes

End Term 3 Exams

Mid Term Exams

End Term 1 Exams

Opener Exams

Full Set Exams