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Byju's Answer

Standard VI

Biology

Organelles

Assertion :Gr...

Question

Assertion :Growth of cell wall occurs by intussusception and apposition. Reason: Primary wall is stretched and material of secondary wall are deposited in form of thin layers.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Plant cells are surrounded by a cellulosic cell wall which is dead at maturity. The cell wall grows only till maturity. The cell wall grows through intussusception and apposition. Intussusception is growth by deposition of new materials between existing components of cell walls. Cell elongation also occurs through intussusception. In apposition, new wall layers are laid and growth of wall in new cells occurs.

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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