Question

Which of the following is not true for open vascular bundles?

• A. Cambium is present between phloem and xylem
• B. They form secondary xylem and phloem tissues
• C. Cambium is absent between phloem and xylem
• D. They are characteristic of dicots

Answer 1

The correct option is C Cambium is absent between phloem and xylem

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 cannot form secondary tissues they are referred to as "closed vascular bundles".