Page 58 - Genius Kidz Prudence Learning Sc-8

Functions :

(i) It determines shape of the plant cell and
protects it.
(ii) It prevents cell dessication and gives it
mechanical strength.

3. Cytoplasm : The protoplasmic fluid
between nuclear membrane and cell
membrane is called cytoplasm. Cytoplasm

comprises of large number of cell
organelles and it supports numerous
biochemical and metabolic events.
(a) Mitochondria : It is a membrane enclosing
oval cell organelle.

It is the site for cellular respiration and thus Plastids
release of energy takes place here in the (c) Endoplasmic reticulum (ER) : Fine tubule
form of ATP (Adenosine Tri Phosphate). So like membrane bound structures extending

mitochondria is called the “power house of from nuclear membrane to cell membrane
the cell” and “ATP” is the “energy currency are called endoplasmic reticulum. These
of the cell.” can be of two types :
(i) Rough endoplasmic reticulum (RER) :
ER with granules is called RER.
(ii) Smooth endoplasmic reticulum (SER) :
ER without granules is called SER.
Mitochondrial
DNA Basic function of ER is the transportation of
Ribosome
Matrix substances.
Inner membrane Outer membrane

Mitochondria
(b) Plastids : They are present in plant cells.
They can be of the following types:

(i) Chloroplasts : Green coloured plastids.

(ii) Chromoplasts : Coloured plastids
(iii) Leucoplasts : Colourless plastids.
ER

A healthy person has 6000 million, million haemoglobin molecules.

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