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Biology Examination Question Paper

Biology Examination

Course:Secondary Level

Exam Year:2011

ANSWER ALL THE QUESTIONS PROVIDED:

1. (a) How may excessive sweating result in death? (4mks)
(b) Name the process by which human body naturally stops bleeding (1mk)
2. Suggest reason why ferns are naturally only found in wet environment (1mk)
3. (a) Name the specific part of the brain that triggers sweating (1mk)
(b) Explain why sweat accumulates on a person skin in a hot humid environment (2mks)
(c) Why do desert animals excrete uric acid rather than ammonia? (2mks)
4. (a) What characteristics do gills of and the mouth cavity of a frog have in common that
enables them to be efficient in gaseous exchange? (3mks)
(b) Describe the changes that occur to the ribcage an the diaphragm during inspiration. (3mks)
5. Give a reason why each of the following steps are followed when prparing cross section of leaf for examination under the microscope.
a)cutting very thin sections (1mk)
b)using a sharp razor blade during cutting (1mk)
c)placing the section in water (1mk)
d)staining the section with iodine before observing (1mk)
6. A student observing an insect using light microscope with eye piece magnification on x10
.If the image observed was magnified 400 times,determine the objective lens magnification
(2mks)
7. A dog weighing 15.2kg requires 216kj while a mouse weighing 50g requires 273kj per day.
Explain (2mks)
8. What is the end product of respiration in animals in insufficient oxygen supply? (2mks)
9. What would happen to:
(a) Red blood cell if placed in hypotonic solution (3mks)
(b) Onion epidermal cells if put in distilled water (4mks)
10. Name three factors that affects the rate of enzyme reaction (3mks)
11.State the function of cristae in mitichondria (1mk)
12.In what form is energy stored in muscles? (1mk)
13.Why does proteolytic enzymes in the gut digest dietary protein but not digest wall of
the gut? (2mks)
14.Why does liver damages lead to impaired digestion of fats? (2mks)
15.Why does food move to the stomach even if one stands on his head? (1mk)
16.Describe immune responses (2mks)
17.What is a vaccine? (1mk)
18.State a role of vaccination in providing immunity (2mks)
19.Which part of the brain controls breathing? (1mk)
20.Give a reason why gills in fish are highly vascularised (1mk)

Biology Examination Question Paper

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