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Question

1. What is osmosis ?

2. What is meant by DNA ?

3. What is meant by cell membrane?

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Solution

Answer 1)

Osmosis can be defined as the movement of water molecules across a semi permeable membrane, from a region of high concentration to a region of low concentration of water. There are two types of osmosis:

Endosmosis: When water enters a cell through osmosis, it is termed as endosmosis.

Exosmosis: When water moves out of a cell through osmosis, it is termed as exosmosis.

Answer 2)

DNA (Deoxyribonucleic acid) is a type of nucleic acid which acts as the genetic material in most of the living organisms. It is a storehouse of information and contains all the information which is necessary for the growth and development of an organism. Also, information is passed on from one generation to another through DNA.

Answer 3)

Cell membrane can be defined as the outer covering layer of the cells which separates the cellular components from the environment. It allows and regulates movements of selected molecules across it so that certain materials can enter and exit the cells.


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