NAME: __________________________________ ADM NO: __________ CLASS: ________________ DATE: __________________
END TERM 3 OPENER 2024
BIOLOGY
1. a
) i) Define the term cell (1mark)
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ii) What is cell biology? (1mark)
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b) i) What is a microscope? (1mark)
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ii) Name the types of microscope (2marks)
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iii)State the purpose of using a light microscope (2marks)
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iv) Give the formula used to calculate magnification in a light microscope(1mark)
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2. Give the reasons for each of the following steps when preparing a cross-section of a stem or leaf for examination under the microscope(4marks)
i) cutting very thin sections
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ii) Using a sharp razor blade during the cutting
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iii) Placing sections in water
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iv) Staining the sections with iodine before observing
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3. List three parts of a cell that can be seen under a light microscope (3marks)
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4. Name two structures which are present in plant cells but absent in animal cells.(2mks)
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5. A form one student observing Onion epidermal cells under the low power objective Counted 5 cells on a field of view measuring 5mm.(2marks)
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6. Name the tissue that carries out the following function in mammals.
a) Transports oxygen throughout the body. (1mark)
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b) Supports the animal's body off the ground. (1mark)
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c) Transmits impulses from one part of the body to another. (1mark)
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7. State three differences between an electron microscope and a light microscope. (3marks)
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8. Give the functions of the following organelles: (2marks)
i). Vacuole
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ii). Cell membrane
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9. Identify the organelle shown below giving its function: (2marks)
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10. The figure below represents a certain cell organelle:-
a) Identify the cell organelle: (1mark)
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b) What is the function of the part labelled A (1mark)
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11. Distinguish between the following terms: -
a) Magnification and resolution of a microscope (2marks)
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b) Mounting and staining of a specimen (2marks)
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12. The diagram below represents two different types of cells. Identify each cell and state its functions.(6marks).
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13. The diagram below shows some components of a light microscope.
a) Name each parts labelled A and B (2marks)
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b) State the functions of each of the parts labelled E and F (2marks)
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c) Give a reason for each of the following precautions when using a light microscope.
i) The microscope must be carried with both hands (1mark)
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ii) The lenses and mirrors must never be touched with bare fingers (1mark)
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