Question

Define Osmosis, Plasmolysis and Diffusion.

Answer 1

OSMOSIS---Movement of water molecules from the region of higher concentration to lower concentration through a semi permeable membrane.

PLASMOLYSIS---Contraction of the protoplast of a cell as a result of loss of water form the cell is known as Plasmolysis.

DIFFUSION---Movement of molecules of solid,liquid and gases from a place of higher concentration to lower concentration.

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Answer 2

Answer: (a) Diffusion

(b) Osmosis  

(a) Diffusion is the self generated movement of molecules from high concentration to low concentration until uniformity is achieved.

Example:

Diffusion of carbon dioxide across plasma membrane.

(b) Osmosis

The movement of water across a semi permeable membrane from its high concentration to low concentration is known as osmosis.

Example:

Swelling of plant cell when placed in a hypotonic solution due to movement of water from solution to cell.