Assertion :Collenchyma is thick walled dead tissue. Reason: Collenchymatous cells show thickenings of pectin.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
Collenchyma cell is the simple permanent tissue which generally has a thin wall with irregular thickening at the corners. The cell wall is composed of lignin and pectin. They provide structural support, particularly in growing shoots and leaves. Cell wall thickness is strongly affected by mechanical stress upon the plant. These are living cells. Thus, option D is correct.

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Similar questions

Q. Given below are assertion and reason. Point out if both true with reason being correct explanation (A), both true but reason not correct explanation (B), assertion true but reason is wrong (C), both are wrong (D)
Assertion. Collenchyma is thick walled tissue.
Reason. Collenchyma is thickened due to deposition of pectin.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

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.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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