Notes of class 9

Cytoplasm :- Cytoplasm is the ground material of the cell. Living cytoplasm exist in two inter convertible forms sol and gel. Cell organelles are present in the cytoplasm. Cytoplasm of a cell is the site of vivo reactions ( chemical reaction ) in the living body.
The part of cell present between cell membrane and nuclear membrane is called the cytoplasm.

Cell organelles present in the cytoplasm :- 
(i) Mitochondria :- 

• The mitochondria is surrounded by double membrane. Outer membrane is continuous and inner wall is folded inward.
• Inner wall of mitochondria after folding inward forms finger like structures called cristae. The cristae contain large number of oxysomes on it which secrete enzymes.
• Ground material of mitochondria is called the matrix.
• Matrix of mitochondria has Ribosomes and DNA. Due to presence of DNA the mitochondria becomes semi autonomous cell organelle.

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In today's class we have discussed till here. We will continue notes in next blog.
Bye...