Assertion :Secondary growth usually occurs in dicotyledonous stems Reason: The vascular cambium present between xylem and phloem possesses the ability to form secondary xylem and secondary phloem respectively

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
Secondary growth usually occurs in dicot stem because the vascular bundle of a dicot stem is conjoint (xylem and phloem together) colateral (present on the same axis) and open (open for secondary growth due to the presence of a cambial strip or lateral cambium in between the xylem and phloem, that cuts off xylem towards the pith and phloem towards the periphery)
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'

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