Sample Online Biology Examination
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- Hits: 180299
- State the functions of each of the following organelles.
(i). Ribosomes (1mark)
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(ii). Golgi apparatus (1mark)
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- In a laboratory exercise a student observing a drop of pond water under a microscope saw
and drew a protozoa. If the magnification of the eye-piece was x5 and that of the objective
lens was x100, what was the magnification of the protozoa? 2mk
3.What do you understand by the following terms 2mks
- a) Anatomy
..................................................................................................................................... b) Biochemistry
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- Why are the following procedures done when preparing sections to be observed under a light microscope? 3mks
(a) Making of thin sections.
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(b) Using a sharp blade to make the sections.
…………………………………………………........................................................................... (c) Staining.
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- State three physiological processes that are involved in movement of substances a cross the cell Membrane. 3mks
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- The diagram below illustrates the behaviour of red blood cells when placed into two different solutions X and Y.
(a) Suggest the nature of solutions X and Y. 2mks
X …………………………………………………………………..
Y ……………………………………………………………………
(b) Name the process A and B. 2mks
A …………………………………………………………………..
B ………………………………………………………………....
(c) What would happen to normal blood cell if it were placed in isotonic solution. 1mk
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7.Give one differences between plants and animals nutrition. 1mk
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- State five adaptations of leaves to photosynthesis. 5mks
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9.The diagram below shows cells in plants:-
(a) Identify the cells shown above 1mk
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(b) Explain how the cells are adapted to their function 2mks
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(c) Name structure labled A 1mk
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10.The chemical equation below represents a physiological process that takes place in living organisms:
Glucose+ Glucose R maltose + Q
P
- Name the process R and P 2mks
R…………………………………………………………………………
P…………………………………………………………………………
- b) Name the substance Q 1mks
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11.Name the diseases caused by deficiency of : 2mks
(a) Iodine …………………………………………………………………………….
(b) Vitamin C ……………………………………………………………………………..
12.The diagram below shows how food boles move along the human oesophogus and the Intestine
(a) Identify the process illustrated in the diagram. 1mks
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(b) Briefly state how the movement of food bolus from position 1 to position 2 is achieved. 2mks
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(c) Name one component of a persons diet that assists in the movement of food described in (b) above. 1 mks
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13.State two factors that affect the rate of osmosis. 2mks
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14.Give two groups of food which are reabsorbed along the mammalian digestive system without undergoing digestion. 2mks
- A solution of sugar cane was boiled with hydrochloric acid and sodium hydrogen carbonate was
added to the solution, which was then boiled with benedicts solution. An orange precipitate was
formed.
(a) Why was the solution boiled with hydrochloric acid and then sodium hydrogen carbonate added in it. 1mk
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(b) To which class of carbohydrates does sugar cane belong? 1mk
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(c) State the form in which carbohydrates are: 2mk
(i) Stored in animals …………………………………………
(ii) Stored in plants …………………………………………
16.State three ways by which the rate of enzyme controlled reactions can be increased. 3mks
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- Study the dental formula given below:
i 0 C 0 PM 3 M 2 . 4 0 3 3
(a) Identify with reasons the mode of feeding of the animals whose dental formula is given above 2mks
Mode of feeding ……………………………………………………………………………………………………….…
Reason ……………………………………………………………………………………………………………
- Calculate the total number of teeth in the mouth of the above animal. 2mks
18.The diagram below represents a longitudinal section through the ileum wall
- a) Identify the structure labeled A and B . 2mks
A ………………………………………………………………………………
B ……………………………………………………………………………..
- b) State one function of A and B 2mks
A………………………………………………………………………………………..
B…………………………………………………………………………………………….
- c) State five adaptations of the ileum. 5mks
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- d) Explain the two roles of the liver in digestion 2mks
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- e) State the role of the pancreas in digestion 1mk
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19.Explain how a flaccid cell can be made turgid (1mk)
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- b) Explain why plant cells do not burst when placed in distilled water 1mk
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- The experiment illustrated below was set up to investigate a certain physiological process
using a raw tuber
(a) Suggest a possible physiological process that was being investigated (1mk)
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(b) Explain the results obtained in the above experiment after a few hours . (2mks)
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- Two fresh potato cylinders of equal length were placed one in distilled water and the other in
concentrated sucrose solution:
(a) Account for the change in length of the cylinder in:
(i) Distilled water 2mks
…………………………………………………………………………………………………………………………………………………………………………………………………………………………… (ii) Sucrose solution 2mks
………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..…………………… (b) (i) What would be the result in terms of length if a boiled potato was used? 1mk
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(ii) Explain your answer in(b)(i) Above. 1mks
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(c) State two uses of the physiological process being demonstrated in the experiment 2mks
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22.List down two differences between polysaccharides and Monosaccharides. (3 marks)
Polysaccharides Monosaccharides
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23.The diagram below represents an organelle in a cell.
(a) Identify the organelle (1mark)
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(b) State the function organelle shown above. (1mark)
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- c) How is the structure labelled K adapted to its function? (2 marks)
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24.Name the two types of periodontal diseases. (2mks)
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25.Give two skills gained by a student learning Biology. 2 marks)
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26 .a) Name the unit of classification that has the least organisms. (1 mark)
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- b) What is Binomial nomenclature in naming organisms. (1 mark)
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- What is the importance of using a hand lens in classification of organisms (1 mark)
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- Give the function of each of the following parts if a light microscope
- i) Revolving nose piece. (1 mark)
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- ii) (1 mark)
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- Write down the difference between plants and animals. 3mks
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30.State precautions taken during collection and observations of specimens . 3mks
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- Give the uses of the following apparatus. 2mks
Sweep net
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Pair of forceps
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- Examine the diagram below carefully and use it to answer the questions that follow:-
- Name the part labelled X. (1mk)
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- b) State one substance by which the part labelled W is made up of. (1 mark)
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- c) Name the process by which mineral salts move into the structure labelled X (1 mark)
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