Download MUSINGU BIOLOGY DECEMBER 2013 HOLIDAY ASSIGNMENT

MUSINGU BIOLOGY
DECEMBER 2013 HOLIDAY ASSIGNMENT
FORM TWO
1. Explain what would happen to onion epidermal cells if they were placed in distilled water.
2. a) State the role of light in the process of photosynthesis.
b) Name one of the end products of dark reaction in photosynthesis.
3. a) What happens to excess fatty acids and glycerol in the body?
b) State two functions of muscles found in the alimentary canal of mammals.
4.State the two functions of the cell organelle that contains chlorophyll in plants.
5.
(i) List any two properties of enzymes
(ii) Put down any two components of gastric juice.
(iii) Explain what happens to a plant cell when it is placed in hypotonic solution.
6. Give the functions of the following parts of the heart.
(i) Pericardium.
(ii) Coronary vein
7.
(i) Give any two functions of human skin.
(ii) List any two adaptations of the liver to its functions.
8. Name the blood vessel that transports blood from
(i) Heart to the lungs.
(ii) Small intestine to the liver
9. State three ways that the tracheole system in insect is adapted for gaseous exchange.
10. Which one of the cell organelles would be more numerous in;
a) An enzyme secreting cell.
b) A rapidly respiring cell in comparison to other cells in the same organism?
11. State the two functions of the cell organelle that contains chlorophyll in plants.
12
(i) List any two properties of enzymes
(ii) Put down any two components of gastric juice.
13. The set up below is used to show that water is given off by leaves during transpiration.
B
B
A
Potted plants
(i)
(i) Name the materials B and A.
(ii)
Rate mg/hr
(ii) Why was set-up (i) included in this experiment?
(iii) Give a reason why the pots were covered with material B.
14 (i) Distinguish between osmosis and active transport.
(ii) Explain what happens to a plant cell when it is placed in hypotonic solution.
15. Give the functions of the following parts of the heart.
(i) Pericardium.
(ii) Coronary vein
16(i) Name the two main antigens that determine human blood groups.
(ii) State the symptoms of haemolytic disease of the new-born
17 Explain briefly the necessity of excretion in animals.
18 State two effects of adrenaline hormone in a human body.
19. The graph below show the effect of pH on the rate of activity of a digestive enzyme found in
human.
PH
a) What is the optimum pH for the enzyme?
b) Name the part of the alimentary canal the enzyme would be active.
c) Suggest the name of the enzyme.
20. A student caught an animal with the following characteristics. Two body parts simple eyes
four parts of legs.
a) To which class does the animal belong.
b) Name the type of skeleton found in the animal.
21. Name two mechanical support tissues in higher plants.
22. The diagram below represents a part of the lower epidermis of a leaf
Nucleus
Stoma
a) Name the cells labeled X and Y.
X …………………………………………………………….
Y ……………………………………………………………..
b) State the function of the cell labeled Y.
23 State two kinds of materials that would be used in cleaning dirty lenses in the care of
microscope.
24. The diagram below shows the generalized structure of a cell. Study it and answer the
questions that follow.
(i) Identify the parts labeled B and C above.
B …………………………………………………………
C ………………………………………………………....
(ii) State one role of the part labeled A
25. State two properties of a cell membrane.
26. Mention three animal structures which are used as surfaces of gaseous exchange.
27. State the differences between open and closed circulatory systems.
28. Name the method of feeding shown by Amoeba.
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