Assertion :Vascular bundles are conjoint, collateral and closed in dicot stem Reason: Vascular bundles are conjoint, collateral and open in monocot stem

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
In dicot stem, each vascular bundle consists of phloem on the outer side, xylem towards the inner side and a strap of cambium in between the two. Phloem and xylem tissues lie on the same radius . Such vascular bundles are known as conjoint (with both phloem and xylem), collateral (phloem and xylem on the same radius ) and open. In monocot stem, phloem lies towards the outside and the xylem on the inner side. Cambium is absent as the whole procambium is consumed in the formation of vascular tissues. The vascular bundles are, therefore, conjoint, collateral and closed.
So, option (D) is the correct answer.

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