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

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. if both assertion and reason are true but reason is not the correct explanation of assertion.
C. if assertion is true but reason is false.
D. if both assertion and reason are false.

Answer

D

Explanation

In dicot stem, each vascular bundle consists of phloem on the outer side, xylem towards the inner side and a strop 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, therfore, conjoint, collateral and closed.