Question

Which one of the following is NOT a plant vascular tissue?

• A. Phloem
• B. Periderm
• C. Stele
• D. Xylem

Answer 1

The Correct Option is B

To determine which one of the options is not a plant vascular tissue, we need to first understand what constitutes plant vascular tissues and their functions.

Plant vascular tissues are essential for the transport of nutrients and water throughout the plant. There are two primary types of vascular tissues:

1. Xylem: This tissue is responsible for the conduction of water and dissolved minerals from the roots to other parts of the plant. It consists of elements like tracheids and vessel elements.
2. Phloem: This tissue is responsible for the transport of organic nutrients, particularly sucrose, from the leaves to other parts of the plant. It includes sieve tubes and companion cells.

Now, let's consider the options given:

• Phloem: As explained above, this is a component of the plant's vascular tissue.
• Periderm: The periderm is part of the outer protective tissue of plants and is formed as a response to secondary growth. It plays a protective role and is not involved in the transport of nutrients or water, which indicates it is not a vascular tissue.
• Stele: The stele is a central part of the root or stem containing the vascular tissue, including both xylem and phloem.
• Xylem: As detailed earlier, this is the vascular tissue responsible for conducting water and minerals.

From the explanation above, it is clear that Periderm is not a plant vascular tissue. This tissue serves a protective function rather than a transport role in plants. Therefore, the correct answer is Periderm.