Assertion :In collateral vascular bundles, phloem is situated towards inner side. Reason: In monocot stem, cambium is present.

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 D Both Assertion and Reason are incorrect.
The collateral bundle is a collection of conducting tissues (xylem and phloem) in the stems and leaves of plants. In stems, phloem is present on the exterior side of the collateral bundle, while the xylem is towards the interior. Further collateral bundles can be either open or closed. The closed collateral bundles do not contain cambium and hence lack secondary growth as is seen in all monocotyledonous plants. However, in dicotyledonous plants, gymnosperms and pteridophytes, a layer of cambium cells are present between the xylem and phloem paving way for secondary growth. Thus, the correct answer is option D.

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Similar questions

Q. Given below are assertion and reason. Point out if both are true with reason bring correct explanation (A), both true but reason is not correct explanation (B), assertion true but reason is wrong (C), both are wrong (D).
Assertion. In collateral vascular bundles, phloem is situated towards inner side.
Reason. In monocot stem, cambium is present

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 – 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

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.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

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Reason:

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formed by decomposition of

{CaCO}_{3}

reacts with

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to form slag.

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