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Form 3 Biology Paper 1 End of Term 3 Examination 2022

Class: Form 3

Subject: Biology

Level: High School

Exam Category: Form 3 End Term 3 Exams

Document Type: Pdf

    

Views: 824     Downloads: 33

Exam Summary

TERM 3-2022
BIOLOGY PAPER 1 (QUESTION PAPER)
FORM THREE (3)
TIME 2HOURS
Name………………………………………………………………Adm No…………………………………
School……………………………………………………………………Class………………………………
Signature…………………………………………………………Date…………………………………………
INSTRUCTIONS
 Write your answers correctly and clearly in the spaces provided
 Be keen on Spelling of Technical Terms

1. a) Define the term Wilting (1mk)
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b) How is wilting important to a seedling (1mk)
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2. Give the name of the enzymes that undertake the following (2mks
i) Digestion of sucrose
…………………………………………………………………………………………………………………………………………………….
ii) Conversion of prothrombin to thrombin
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3. a) Explain why a person of blood group Ocan not receive blood from a donor of blood group B (2mks
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b) Give ONE precaution observed before blood transfusion (1mk
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4. Name the instruments used during the following activities in an ecological study
a) Suction of small insects from the bark of trees (1mk
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b) Determine the depth of penetration of light in a fish pond (1mk
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5. While studying onion cells under a light microscope, Susan observed 10 cells along the diameter of field of view with a radius of 3mm
a) What is field of view? (1mk
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b) Determine the diameter of one cell observed (2mks
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c) If the actual diameter of one cell is 0.0003mm, determine the total magnification Susan used (2mks
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6. Explain how the following help in the process of photosynthesis
i) Guard Cells………………………………………………………………………………………………………………………….
…………………………………………………………………………………………………………………………………………(1mk
ii) Stomata………………………………………………………………………………………………………………………………….
…………………………………………………………………………………………………………………………………………(1mk
7. Differentiate between the following terms:
i) Synecology and autecology (2mks
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ii) Innate immunity and acquired immunity (2mks
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8. The diagram shown below represents the human respiratory system
26.png
a) Name the structure found in region P that prevent entry of food bolus into region Q during swallowing?
…………………………………………………………………………………………………………………………………………..…….(1mk
b) Give TWO adaptations of part Q to its function (2mks
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c) Name the actual site of gaseous exchange found in the organ labelledR
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9. The diagram shown below is a common organelle in cells
27.png
i) Name the organelle shown above (1mk
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ii) Give TWO functions of the organelle (2mks
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10. Consider the specimen provided below together with their family names
28.png
a) Give a reason why the organisms shown above belong to Phylum Arthropoda
……………………………………………………………………………………………………………………………………….…………(1mk
b) Use the features shown above and in the same order to construct a dichotomus key to identify the families of the organisms shown above (2mks
1. Antennae
2. Wings
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11. a) Name the organisms that act as the following for Malaria disease (2mks
i) Cause: …………………………………………………………………………………………………………………………………..
ii) Vector: …………………………………………………………………………………………………………………………………..
b) Give TWO measures used to control Malaria by targeting the vector (2mks
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12. The photograph shown below represents one way of environmental pollution
29.png
a) Give TWO ways by which the above affects life of fish in Lake Victoria (2mk
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b) Name TWO pollutants that cause acid rain (2mk……………………………………………………………………………………………………………………………………………………………
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13. The sketch shown below represents a process in the mammalian body
30.png
a) Where does processX occur? …………………….………………………………….………………………….(1mk
b) State the significance of this process in digestion (1mk
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14. Explain the significance of the following:
a) The testes are found hanging outside the bodyof males (1mk
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b) It is advisable to use the fine adjustment knob to focus image when the high power objective lens is in position (1mk
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15. How are the following preventednaturally in the human body
a) Blood clotting in uninjured blood vessels (1mk
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b) Corrosion of stomach lining by hydrochloric acid secreted by glands in the stomach (1mk
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c) Ovulation during pregnancy (1mk
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16. James wrote the scientific name of human being as HOMO SAPIENS
a) Name this system of naming organisms (1mk
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b) Write the scientific name in the correct manner (1mk
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17. The following diagram represents the embryo sac of a flower
31.png
a) Which letter represents parts that form the following after fertilization
i) Zygote ……………………………………………………………………………………………………..………………(1mk
ii) Endosperm……………………………………………………………………………………………..……………..(1mk
b) Plants like banana and pineapples form fruits without fertilization. Which term describes this phenomenon?
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…………………………………………………………………………………………………………………………………………………(1mk
18. Three potato strips each measuring 2.0mm were placed in three separate solutions and after 20minutes their lengths were as follows
32.png
a) Which of the solutions is:
i) Isotonic………………………………….………………………………………………………………………………..(1mk
ii) Hypertonic……………………………………………………………………………………………………………..(1mk
b) Account for the change in potato strip placed in solution B (2mk
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19. An illustration of the mammalian heart is shown below
33.png
a) i) Identify the heart chamber labelledZ (1mk
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ii) Give a reason for your answer in ai) above (1mk
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b) State the importance of part W (1mk
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c) Name a class in Phylum Chordata where all members have the type of heart shown above (1mk
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20. a) Describe the role of prothoracic gland in growth and development of insects
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……………………………………………………………………………………………………………………………………………………(2mks
b) Why is internal fertilization advantageous? (1mk
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21. During a field study, a group of students captured 500 cockroaches, labelled them with a dye and released them back to the building. 24 hours later, the students captured 600 cockroaches and realized 350 lacked the dye.
a) Determine the population of cockroaches in the building (2mks
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b) Give TWO assumptions of this method of population estimation (2mk
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22. The set up shown below was used to investigate a physiological process
34.png
a) State the aim of the experiment (1mk
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b) Why is it advisable to boil the sugar solution before the experiment? (1mk
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c) State the importance of the physiological process being investigated in agriculture (1mk
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23. a) What is Seed dormancy? (1mk
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b) Explain the importance of Oxygen during seed germination (1mk
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24. The diagram below represents a cross-section of a leaf
35.png
a) Identify the habitat of the plant from which the leaf was obtained (1mk
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b) Identifya reason for your answer in a) above (1mk
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c) How does part F adapt the plant to its habitat? (1mk
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25. The table below shows the composition of blood, glomerular filtrate and urine of a patient
36.png
a) Account for the following
i) Absence of proteins in the glomerular filtrate (1mk
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ii) Increased concentration of Urea in the Urine (1mk
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b) Which disease is the patient likely to be suffering from? (1mk
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c) Give a reason for your answer in b) above (1mk
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26. The equation for respiration of a certain substrate is shown below
37.png
a) Calculate the Respiratory Quotient (2mks
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b) Identify the type of respiration that took place (1mk
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