1. CELL IS A UNIT OF LIFE
PRESENTED BY: PN. SHAMSIDAR BT. RAMLI

2. INTRODUCTION What is cell? 1. Cell is the basic unit of living things
2. All living things are made up of one or more cells.
3. The term ‘cell’ was first used by Robert Hooke, a botanist. He observed that cells in a sliced piece of cork and the cells of a honeycomb alike.
4. You need a microscope to observe cells.

3. ANIMAL CELLS Funtions as control centre of the cell Nucleus
Cell membrane
Control the movement of materials in and out of the cell
Cytoplasm
Chemical reaction takes place here in which new substances are formed by giving out or taking in energy

4. PLANTS CELL Cytoplasm Nucleus Starch grains chromosomes Cell membrane
Cell wall
Chloroplasts
Cell sap
Vacuole

5. PLANTS CELLS FUNCTIONS
1. Nucleus
Functions as control centre of the cell
2. Cytoplasm
Chemical reaction takes place here in
3. Cell membrane
Control the movement of materials in and out of the cell
4. Cell wall
Gives it regular shape, supports and holds the cell

6. PLANTS CELLS FUNCTIONS
5. Chloroplasts
Contains chlorophyll, a substance needed in photosynthesis
6. Starch grains
Store food

7. Differences between an animal cell and plant cell
Has an irregular and variable shape
Has a regular and fixed shape
Has no cellulose cell wall
Has a cellulose cell wall
Has no chloroplasts
Has chloroplasts
Has many small vacuoles
Has a large vacuoles
Has no stored food
Has stored food in the form of starch grains

8. MICROSCOPE

9. PARTS OF MICROSCOPE Parts of microscope Function Eye piece
For looking at specimens
Objectives lens
Enables greater magnification of a specimen by moving body tube up and down
Coarse adjustment
For getting a rough focus of specimen
Fine adjustment
For setting a sharp focus of a specimen
Stage
A platform to put slides of a specimen
Diaphragm
For controlling the amount of light to view a specimen
Mirror
For reflecting light up through the slide on the stage to the eye

10. Questions 1. An animal cell has a variable shape because
A. It has a very small vacuoles
B. Its cell membrane is flexibles
C. It does not have chloroplasts
D. Its nucleus is small and dence
Answer : B

11. QUESTIONS 2. The vacuole in a plant cell is filled with A. chlorophyll
B. water
C. cell sap
D. chromosomoes
Answer : C

12. QUESTIONS
3. The diagram below shows a typical animal cell. Name the parts of the diagram labelled P, Q, R, S and T.
Answer :
P - nucleus
R - cytoplasm
T – cell membrane
Q - chromosomes
S - vacuole

13. QUESTIONS 4. Name the part of a plant cell that a) stores food
starch grains
b) Gives it regular shape, supports and holds the cell
cell wall
c) controls all the activities in the cell.
nucleus

14. QUESTIONS
5. Give four differences between an animal cell an a plant cell
a) Has no cell wall
b) Has no chloroplasts
c) Has no starch grains
d) Has no vacuole
THE END