ZERAKI ACHIEVERS’ EXAMINATIONS (2023)
TERM 1 – 2023
BIOLOGY (231/1)
FORM TWO (2)
Time: 2 Hours
Name: …………………………………………………………. Adm No: ……………….
School: ……………………………………………………….. Class: …………………..
Signature: …………………………………………………….. Date: …………………...
INSTRUCTIONS
1. This Paper has TWO Sections A and B
2. All Questions are Compulsory.
3. Write your Answers in the Spaces Provided.
4. Wrong Spelling of Technical Terms shall be Penalized.
SECTION Max Student’s
Score Score
A 40
B 40
TOTAL 80
SECTION A (40 MARKS)
1. a) Define the term Classification (1mk
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b) Give TWO conditions that must be met for two organisms to be of same species (2mks
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2. State the name and use of the following laboratory equipment in biological studies (6mks
EQUIPMENT NAME FUNCTION
3. a) Identify the tissues shown below (2mks
A……………………………………. B…………………………………………….
b) State the importance of A in human body (1mk
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4. a) Name the parts of a microscope that are used for the following functions (2mks
i) Control amount of light entering the microscope stage
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ii) Adjust the high power objective when observing images
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b) State TWO importance of cover slip in microscope work (2mks
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5. State the functions of the following parts of a root (2mks
a) Pericycle
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b) Endodermis
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6. The diagram shown below is found in the alimentary canal of mammals
a) In which part of the alimentary canal is the structure above found? (1mk
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b) Identify and give the function of the part labelled X (2mks
Name ……………………………………………………………………………………….
Function …………………………………………………………………………………….
7. The graph shown below represents the rate of reaction of different enzymes when subjected
to varied pH levels
a) With a reason, name the part of the alimentary canal where ezyme A is found
i) Part …………………………………………………………...…………………(1mk
ii) Reason ………………………………………………………..………………..(1mk
b) The rate of reaction for enzyme B declines after pH 7. Explain (1mk
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8. State TWO good practices of handling and care of light microscope lenses (2mks)
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9. a) State the significance of secreting Trypsin in their inactive forms (1mk
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b) Name the substance that activate the following compounds into their active forms:
i) Pepsinogen ……………………………………………………………………….....(1mk
ii) Trypsinogen ………………………………………………………………….….....(1mk
10. a) State the importance of red blood cells lacking the following organelles (2mks
i)Mitochondria………...........................................................................................................
ii)Nucleus…….......................................................................................................................
b) Give differences between leucocytes and erythrocytes in terms of the following (3mks
Feature Erythrocytes Leucocytes
Site of Formation
Haemoglobin
Function
11. A plant cell developed the appearance below after being placed in solution Q for 1 hour
a) Give the term used to describe the appearance of the cell above (1mk
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b) How can the cell be made to reveert to its normal appearance? (1mk
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c) Name the process that will allow entry of solution found in part labelled 2 (1mk
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12. a) State the functions of the following parts of the mammalian heart (2mks
i) Interventricular septum …………………………………………………………………..
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ii) Semi-lunar valve in the right heart chambers ……………………………………………
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b) Why is the cardiac muscle said to be myogenic? (1mk
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SECTION B (40 MARKS)
13. Study the photomicrograph shown below and answer questions that follow
X3000
a) Is this a plant cell or an animal cell? (1mk
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b) Give TWO reasons for your answer in a) above (2mks
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c) How is mitochondria important in the functioning of organelle labelled P (2mks
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d) Determine the actual diameter of the cell represented by the dark line in micrometers
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14. The skull of an animal is shown in the diagram below.use it to answer questions that follow
a) Name the mode of feeding of the animal with the jaws above (1mk
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b) Give TWO reasons for your answer in a) above (2mks
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c) Why do the animals with jaws above have a shorter alimentary canal (2mks
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d) If an adult human being has 8 premolars, 4 canines, 12 molars and 8 incisors, write
down the correct dental formula (1mk
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e) Give TWO ways in which the pulp cavity is important to the fucntion of the teeeth
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15. The diagram shown below represents the sequence followed in the laboratory during the
testing for starch in the leaf
a) What is the importance of the following stages (3mks
i) Boiling leaf in water
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ii) Boiling leaf in Ethanol
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iii) Heating the ethanol indirectly over a water bath
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b) Fill in the table below to shown the conclusion if the folowing colours are observed
after placing drops of iodine onto the leaf at the end of the experiment (2mks
COLOUR OBSERVED CONCLUSION
Blue Black
Brown
c) Write a word equation for photosynthesis processs (1mk
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d) Give TWO reasons why carbohydrates are stored as starch and not glucose in plants
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16. The following set up wasused to investigate a physiological process in organisms
a) Why was the set up maintained at 37oC? (1mk
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b) What is the observed colour in the following beakers at the end of the experiment (2mks
i) Beaker X……………………………………………………………………………...
ii) Beaker Y……………………………………………………………………………..
c) Account for the size of the visking tubing in Beaker Y at the end of the experiment
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d) State the importance of the physiological process being investigated to plants (2mks
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17. The shown below is a tissue found in plants
a) Give the function and identity of the tissue above (2mks
Identity …………………………………………………………………………………
Function ………………………………………………………………………………..
b) Identify the parts of the tissue labelled as : (2mks
i) A ……………………………………………………………………………………..
ii) D …………………………………………………………………………………….
c) Name the structure that links part labelled B to that labelled D (1mk
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d) Give THREE adaptations of the tissue shown above to its function (3mks
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