Question

Assertion: Cells of Fungi are able to withstand very dilute external medium without bursting.
Reason: In such a medium cells take up water by diffusion and swell , exerting a pressure on the cell wall. The cell wall exerts an equal pressure on the ‘swelling’ cytoplasm.
Guys pls help

Answer 1

Answer:

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cell walls permit the cells of plants,fungi and bacteria to withstand very dilute (hypotonic) external media without bursting because in such media the cells tend to take up water by osmosis. The cell swells , building up pressure against the cell wall.

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Answer 2

Both assertion and reason are true and reason is correct explaination of assertion about swelling of cytoplasm.

• Fungi, bacteria and plant cell contain cell walls. This cell wall helps them in surviving extreme conditions, provide mechanical support and rigidity to plants etc.
• Cell wall of fungi is made of chitin, cell wall of plant is made of cellulose and bacteria has cell wall of peptidoglycan.
• Animal cells lack cell wall, which is evident from the Red Blood Cell experiment, which bursts when kept in distilled water.