Question

Which type of vascular bundles are found in monocot stem?

• A. Collateral, open, endarch
• B. Radial, open, diarch
• C. Radial, open, mesarch
• D. Collateral, closed, endarch

Answer 1

The correct option is D Collateral, closed, endarch

Monocot stem vascular bundles are found irregularly scattered in the ground tissue. Towards the periphery, the bundles are smaller in size while towards the centre, they are larger in size. The smaller bundles are younger, while the larger ones are older. Hence, the arrangement is described as centrifugal or endarch.

Each vascular bundle has a covering, called as bundle sheath formed by a single layer of sclerenchyma cells. The vascular bundle encloses both xylem and phloem. Xylem is found towards the inner surface and phloem towards the outer surface. Cambium is absent. Hence, the vascular bundles are described as conjoint, collateral and closed.