NAME: _______________________________ADM NO: ________ CLASS: _____
DATE: ______________________________ SIGN: _______________________
BIOLOGY
FORM:ONE
TERM 3 2024
OPENER EXAMINATION
INSTRUCTIONS: Answer all the Questions TIME: 1 HR 30 MIN
1. a) i) Define the term cell 1mark
ii) What is cell biology? 1mark
b) i) What is a microscope? 1mark
ii) Name the types of microscope 2marks
iii)State the purpose of using a light microscope 2marks
iv) Give the formula used to calculate magnification in a light microscope
1 mark
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
cutting very thin sections
Using a sharp razor blade during the cutting
Placing sections in water
Staining the sections with iodine before observing
1
3. List three parts of a cell that can be seen under a light microscope
3 marks
4. Name two structures which are present in plant cells but absent in animal
cells 2marks
5. A form one student observing Onion epidermal cells under the low power objective Counted 5 cells
on a field of view measuring 5mm.
a) Estimate the size of one cell. 3 marks
b) If the eye piece magnification used was × 10 and that of the objective lens was × 10. What was the
magnification of the microscope? Show your working.
2 marks
6. Name the tissue that carries out the following function in mammals.
a) Transports oxygen throughout the body. (1 mark)
b) Supports the animal's body off the ground. (l mark)
c) Transmits impulses from one part of the body to another. (1 mark)
7. State three differences between an electron microscope and a light microscope. (3 marks)
ELECTRON MICROSCOPE LIGHT MICROSCOPE
2
8. Give the function(s) of the following organelles: - 2marks
i) Vacuole
ii) Cell membrane
9. Identify the organelle shown below giving its function: - 2marks
Organelle
Function
10. The figure below represents a certain cell organelle: -
a) Identify the cell organelle: 1mark
b) What is the function of the part labelled A 1mark
11. Distinguish between the following terms: -
a) Magnification and resolution of a microscope 2 marks
b) Mounting and staining of a specimen 2 marks
3
12. The diagram below represents two different types of cells. Identify each cell and state its functions.
6 marks
CELL IDENTITY FUNCTION
A
13. The diagram below shows some components of a light microscope.
4
a) Name each parts labelled A and B 2 marks
A
B
b) state the functions of each of the parts labelled E and F 2 marks
E.
F.
c) Give a reason for each of the following precautions when using a light microscope.
i) The microscope must be carried with both hands 1 mark
ii) The lenses and mirrors must never be touched with bare fingers 1 mark
