Page 57 - Genius Kidz Prudence Learning Sc-8

CELL STRUCTURE

Golgi apparatus

Mitochondrion
Lysosome

Golgi
vesicles
Nucleolus
Rough ER
(endoplasmic
reticulum)

Nucleus
Smooth ER
(no ribosomes)

Cell (plasma) Microtubules
membrane

Centrioles (2) Cytoplasm
Each composed
of 9 microtubule
triplets Ribosome

Generalised Cell Structure

Each cell has a jelly like living matter called Functions :
protoplasm (proto = first and “plasm” = liquid). (i) It provides a shape to the animal cell and
This protoplasm is surrounded by a cell protects it.
membrane. Protoplasm, in turn, comprises of (ii) Due to its semi-permeable nature it
cytoplasm and nucleoplasm.
allows only selective material to move in
DIFFERENT PARTS OF A CELL and out of the cell.

1. Cell membrane : It is also called plasma 2. Cell Wall : In plant cell, cell wall is present in
membrane. It is composed of lipoprotein. It addition to cell membrane. It is composed
is semi-permeable or selectively of cellulose. It is thick, strong, rigid and non-
permeable in nature which means it allows living. It is present outside the cell
only specific substances to move in or out membrane.
of the cell.

The size of the cell has no relation to the size of the organism.

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