Assertion : To countract the increases in turgour pressure in plant cells, the cell wall produces an equal and opposite pressure, i.e. , wall pressure .
Reason : When plant cells undergo endomosis, they swell but do not burst.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

A

Explanation

If a living plant cell is immersed in water, it swells due to absorption of water. As a result of the entry of water into the cell sap, a pressure is developed in the protoplasm which presses against the cell wall is the turgor pressure which is always less than osmotic pressure unless the cell is in distilled water. The cell wall is rigid and elastic therefore it exerts an equal and opposite pressure against the expanding protoplasm. This pressure is called wall pressure.