First slide

The Tissue System

Question

The vascular bundles are closed in monocots because

Easy

A

xylem and phloem are present.
B

xylem and phloem occur in separate bundles.
C

cambium is present between xylem and phloem of vascular bundle
D

cambium is not present in the vascular bundle

Solution

The vascular system consists of complex tissues, the phloem and the xylem. The xylem and phloem together constitute vascular bundles. 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, and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.

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