Q17 / 180 · NEET 2015 (Phase 1) · Botany

Vascular bundles in monocotyledons are considered closed because:

A
A bundle sheath surrounds each bundle.
Correct answer
B
Cambium is absent.
C
There are no vessels with perforations.
D
Xylem is surrounded all around by phloem.

Solution

The vascular bundles of monocotyledonous plants do not contain a layer of meristematic tissue (cambium) as the dicots do. Thus, no new cells can be formed inside the vascular bundles of monocots and their vascular bundles are termed closed whereas those of dicot plants are open.

Hence, the correct answer is option: 'B'.

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