Question

What do you mean by closed vascular bundle?

• A. Presence of cambium
• B. Presence of periderm
• C. Absence of cambium
• D. None of the options

Answer 1

The correct option is C

Absence of cambium

The correct option is C.

Explanation of correct option:

1. A closed vascular bundle signifies that cambium is absent.
2. A closed vascular bundle does not possess the tendency to produce the phloem tissues and secondary xylem.
3. It is present in monocotyledonous plants.

Explanation of incorrect options:

Option A:

1. In open vascular bundles, cambium is present between the xylem and phloem.
2. The open vascular bundles possess the tendency to produce phloem tissues and secondary xylem.

Option B:

1. The periderm is generally situated external to the branch and stem phloem.
2. It is a multi-layered tissue system, which generally comprises the phellem or cork, phellogen or cork cambium, and secondary cortex or phelloderm.

Final answer: Closed vascular bundle means the absence of cambium.