Assertion (A) : Stems of dicots show secondary growth.
Reason (R) : Stems of monocots possess radial vascular bundles

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A is correct, R is not correct.

A and R are true and R is the correct explanation of A.

Both A and R are not correct.

A and R are true and R is not the correct explanation of A.

answer is A.

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Detailed Solution

Conceptual

In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues.

The growth of the roots and stems in length with the help of apical meristem is called the primary growth.

Apart from primary growth most dicotyledonous plants exhibit an increase in girth. This increase is called the secondary growth. The tissues involved in secondary growth are the two lateral meristems: vascular cambium and cork cambium.

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