Best Day of My Life

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1. What is a cell?
A cell is the basic unit of all living things.
It is the smallest part of a living thing that is alive.
2. What instrument is used to see cells?
A microscope is used to see cells as they are very small.
(i) What are the types of microscope used?
1. School microscope 2. Eclectron microscope

Unicellular and Multicellular Organisms
1. What are Unicellular Organisms?
Some living things which have just one cell are known as unicellular orgaisms. 2. Give examples of unicellular organisms.
Examples are Amoeba, Paramecium, and Euglna.
3. What are Multicellualar organisms?
Most living things made up of many cells are called multicellular organisms. * Examples are human beings which have a large number of cells.

Inside Cells

* Organisms have many different kinds of cells which exist in various shapes and sizes.

Animal Cells

Animal cells consist of the cell membrane, cytoplasm, vacuoles, and nucleus.

What are the functions of the following parts of the animal cell:- i) Cell membrane
ii) Cytoplasm
iii) Vacuoles
iv) Nucleus

i) Cell membrane
* This is a thin layer around the cell.
* It controls the movement of substances in and ou of the cell, such as food, water, oxygen and wastes. * As it is thin the shape of the cell can change.

ii) Cytoplasm
* This is a jelly-like mixture that fills the cell.
It contains water and many other substances.
* Many chemical reactions take place in it.

iii) Vacuoles
* These are small spaces containing air, liquid or food particles. * Animal cells have too many small vacuoles.

iv) Nucleus
* It controls the activities of the cell.
* It contains chromosomes.

Plant cells
What are the main parts found in a plant cell?
1. Chloroplasts
2. Cytoplasm
3. Cell wall
4. Cell membrane
5. Nucleus
6. Vacuole