PEKA

PEKA 1PEKA 1NameName ::

Class : 1K

Title : Cell as a basic unit

of life

Instrument : Scrap book

Date of submission : 5 May 2008

CELLCELL

1.1. All living things are made All living things are made up of cellsup of cells

2.2. Cellls are the units of lifeCellls are the units of life

Animals CellAnimals Cell1. Cells from the inner

surface of our checks can be carefully scratched out and examined under a microscope.

2. Each cheek cell is rounded with a piece of nucleus in the middle.

3.3. The cell is filled with a The cell is filled with a transparent jelly like transparent jelly like substance called the substance called the cytoplasmcytoplasm

4.4. The nucleus and the The nucleus and the cytoplasm are made of a cytoplasm are made of a living substance called living substance called photoplasm. Both photoplasm. Both structures together structures together maybe referred to as maybe referred to as protoplasmprotoplasm

5.5. Each cell is enclosed by a Each cell is enclosed by a cell membrane which cell membrane which allows liquids to move in allows liquids to move in and out.and out.

Plant CellsPlant Cells

1.1. Plants are also made up Plants are also made up of cells.of cells.

2.2. If the skin of an onion are If the skin of an onion are a leaf from a hydrilla a leaf from a hydrilla weed is examined under a weed is examined under a microscope, its cells can microscope, its cells can be easily seen.be easily seen.

3.3. The structure of a typical The structure of a typical plant cell is shown in Diagram plant cell is shown in Diagram 22

4.4. Each cell is enclosed by a cell Each cell is enclosed by a cell membrane, which is membrane, which is protected by a cell wall. The protected by a cell wall. The cell wall is made of cellulose.cell wall is made of cellulose.

5.5. Each cell has a nucleus and is Each cell has a nucleus and is filled with a jelly-like filled with a jelly-like substance called cytoplasm. substance called cytoplasm. Both the nucleus and the Both the nucleus and the cytoplasm are made of a cytoplasm are made of a living substance called living substance called protoplasmprotoplasm

6.6. An old plant cell ahs a large An old plant cell ahs a large space filled with cell sap. space filled with cell sap. This space is called a vacuole.This space is called a vacuole.

7.7. Plant cells which make Plant cells which make food such as the cells in a food such as the cells in a hydrilla leaf contain tiny hydrilla leaf contain tiny green bodies called green bodies called chloroplasts.chloroplasts.