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2015 KCSE Tharaka South Joint Examination

Biology Paper 1

1.

Give two characteristics that distinguish scientific names of organisms from the ordinary names.

2 marks

2.

Identify the structure of the cell that perform the following functions: (1 mark)
a) Synthesize ribosomes (1 mark)
b) Regulate exchange of substance in and out of the nuclear. (1 mark)
c) Division of cells to form new ones. (1 mark)

3 marks

3.

A student set up an experiment as shown in the diagram below.


a) (i)What was being investigated in the experiment? (1 mark)
ii.Draw a diagram to indicate the expected results of the experiment after three days. (1 mark)
iii.Why was it necessary to have wet cotton wool in the container. (1 mark)
b) What is the role of the following in a germinating seed. (1 mark)
i. Oxygen (1 mark)
ii. Cotyledons (1 mark)

3 marks

4.

Name two enzymes and one ion metal that are needed in the blood clotting process.

3 marks

5.

Name the polysaccharides found in the following structures. (1 mark)
a) Exoskeleton (1 mark)
b) Xylem vessels (1 mark)

3 marks

6.

Outline three ways in which the gills of tilapia fish are modified to perform their functions.

3 marks

7.

The graph below shows the effect of substrate concentration and the rate of enzyme reaction.


a) (i) Account for the shape of the graph between (2 marks)
i. A and B
ii. B and C
b) How can the rate of reaction be increased after point B? (1 mark)

3 marks

8.

Two potted plants A and B were placed in the dark for two days. Each was then placed in an air tight bell jar as follows then transferred to light for four hours. Each plant was then tested for starch.


a) why were the plants put in the dark place for two days. (1 mark)
b) what was the result of the starch test in plant B.Expain your answer. (2 marks)

3 marks

9.

identify two adaptations of vertebrae neurone that affects the speed of impulse transmission.

3 marks

10.

(a)State the kingdom to which chladydomonas belong. (1 mark)
(b)An organism has the following characteristics:
_ Four pairs of wings
_ Cephalothorax and abdomen
_ Absence of antennae
_ Presence of a pair of chelicerae
Name the phylum and class that the organism belongs to? (2 marks)
Phylum
Class

3 marks

11.

Study the diagram shown below of the anterior view of a lumbar vertebra of a mammal.


a) Name the parts labelled A and B (2 marks)
b) State the function of part C (1 mark)

3 marks

12.

Name the type of response shown by:
a) Leaves of mimosa pudica when they fold after being touched. (1 mark)
b) Euglena when it swims towards the source of light. (1 mark)
c) Maggots moving from the lit side of a boiling tube to the side painted black. (1 mark)

3 marks

13.

(a) Give two possible ways of establishing the genotype of an organism whose genotype is unknown. (2 marks)
(b) Euglena when it swims towards the source of light. (1 mark)
(c) Give the genotype of a male who could be born haemophiliac. (1 mark)

4 marks

14.

The diagram below shows a structure for gaseous exchange in class Pisces.


a) Identify the structure. (1 mark)
b) State the function of the part labelled C.
c) How is the structure labelled B adapted for its function? (1 mark)

4 marks

15.

a)State two advantages of internal fertilization. (2 marks)
b) Give reasons why a woman excretes less urea when she becomes pregnant. (2 marks)

4 marks

16.

The diagram below represents part of phloem tissue.


a) Name the structures labelled R and S and the cell labelled T. (3 marks)
R
S
Cell labelled T
b) State the function of the structure labelled S (1 mark)

4 marks

17.

Distinguish between natural and acquired immunity.

2 marks

18.

a)What is the difference between Darwinian and Lamarkian theories of evolution? (2 marks)
b) What is meant by the term vestigial structures? Give one example. (2 marks)

4 marks

19.

Name the hormone responsible for:
a) Conversion of glycogen to glucouse (1 mark)
b) Regulation of the amount of water in the blood (1 mark)

2 marks

20.

Name the substances produced as a result of anaerobic respiration in:
i. Yeast (1 mark)
ii. Human muscles (1 mark)

2 marks

21.

Account for the osmoregulatory changes that would take place in a marine amoeba if it was transferred to a fresh water environment.

3 marks

22.

a) What is meant by resolving power of a microscope. (2 marks)
b) State the reason behind the addition of iodine solution, to an onion epidermis on a slide while being observed on alight microscope. (1 mark)

3 marks

23.

Why is excretion of nitrogenous wastes more of a problem to animals than plants.

3 marks

24.

Explain why sweat accumulates on a person’s skin in a hot humid environment.

2 marks

25.

a)Name two kinds of nuclei found in a mature pollen grain. (2 marks)
b) State what is meant by double fertilization in flowering plants. (2 marks)

4 marks

26.

a) State the role of active transport in animal nutrition. (1 mark)
b) Give two factors which affect active transport. (2 marks)

3 marks

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