MANGU HIGH SCHOOL

Name: .................................................................................... Adm. No: ..............................

231/1
BIOLOGY
PAPER 1
FORM 1
END OF THE YEAR EXAMS - 2024
TIME: 2 HOURS

Instructions to Candidates:

i. Write your Name, Class and Adm. Number in the spaces provided
above.
ii. Answer all the questions in the spaces provided.
iii. All answers should be written in spaces provided in question paper.

FOR EXAMINER’S USE ONLY

1 - 30 80

This paper consists of 9 printed pages. Ensure that all pages are there.

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1. Define the following branches of biology. (2mks)

i) Genetics

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ii) Entomology

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2. a) Define the term species. (2mks)

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b) Which taxonomic group has the largest number of members? (1mk)

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3. a) Name the laboratory apparatus used for the following. (2mks)

i) catching small flying insects

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ii) sucking small animals from rock surfaces or barks of trees.

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4. Name any three specialized plant cells. (3mks)

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5. State the function of each of the following organelles. (3mks)

i) Nucleolus

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ii) Golgi apparatus

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iii) Centrioles

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6. The diagram below represents a longitudinal section of a human tooth.

a) Identify the type of tooth. (1mk)

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b) Give a reason for your answer in (a) above. (1mk)

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c) State one function of the tooth. (1mk)

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d) Name the parts labelled (2mks)

i) P …………………………………………………………………………………

ii) Q ……………………………………………………………………………….
e) State one function of the part labelled Q (1mk)

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7. Distinguish between Homodont and Heterodont dentition and give an
example of an animal in each. (2mks)

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8. Name two raw materials for photosynthesis. (2mks)

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9. A tiger is known as Panthera Tigris.

a) Identify two mistakes made in typing the scientific name. (2mks)

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b) Explain why a leopard and tiger cannot breed yet they belong to
the same genus. (1mk)

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10. A cell was magnified 200 times using a light microscope whose eyepiece
lens magnification was x10. What was the magnification of the objective
lens. (2mks)

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11. State three roles of osmosis in living organisms. (3mks)

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12. The structures below represent specialized cells in man.

a) Identify the structures x and y (2mks)

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Y ………………………………………………………………………………….

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 b) Give reasons for your answer in (a) above. (2mks)

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13. Which factor inactivates enzyme action? (1mk)

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14. A group of Mangu students set up an experiment to investigate a certain
physiological process. The set up was as shown in the diagram.

a) What physiological process was being investigated? (1mk)

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b) After sometime, the students observed that the level of sugar solution
had risen. Account for the rise in the level of sugar solution in the
experiment. (3mks)

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c) What results would the students obtain if they repeated the
experiment using a pieced of boiled pawpaw. (1mk)

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15. Fatty acids + glycerol A triglyceride + water

a) State the reaction taking place in A. (1mk)

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b) State two functions of lipids in animals. (2mks)

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16. Distinguish between competitive and non-competitive inhibitors. (2mks)

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17. Explain why it is not advisable to transfuse a patient with distilled water.
(2mks)

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18. The graph below shows the activity of a certain enzyme.

(i) What is the optimum temperature for the enzyme? (1mk)

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 (ii) Why does enzyme activity decrease beyond the optimum
temperature?
(1mk)

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19. What are the building blocks of

(i) Proteins (1mk)

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(ii) Lipids (1mk)

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20. While testing for non-reducing sugars, what is the function of

(i) Dilute hydrochloric acid (1mk)

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(ii) Sodium hydrogen carbonate (1mk)

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21. What is the name of a bond that hold two monosaccharides together.
(1mk)

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22. Draw a well labelled chloroplast (4mks)

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23. Name three environmental factors which may affect the rate of
photosynthesis. (3mks)

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24. Give two adaptations of palisade mesophyll tissue to its function. (2mks)

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25. Explain what happens in photolysis. (3mks)

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26. What would be the expected observation in the following tests if the result
were positive.

i) Test for starch (1mk)

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ii) Test for non-reducing sugars (1mk)

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iii) Test for ascorbic acid (1mk)

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iv) Test for proteins (1mk)

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27. State two adaptations of the guard cells to their function. (2mks)

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28. Define the following terms as used in cell physiology.

i) Hypotonic solution (1mk)

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ii) Hypertonic solution (1mk)

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iii) Isotonic solution (1mk)

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29. Define the following terms

i) Digestion (1mk)

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ii) Egestion (1mk)

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30. Name two salivary glands found in the mouth. (2mks)

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