Which of the following is known as wood

Options

A. Primary xylem
B. Secondary xylem
C. Secondary phloem
D. Cambium

Answer

To determine which of the following options is known as wood, we need to analyze each option provided:

1. **Primary Xylem**: This is the first xylem formed during the growth of a plant. It consists of protoxylem and metaxylem, which are responsible for water conduction in young plants. However, it does not constitute wood.

2. **Secondary Xylem**: This is the xylem produced by the vascular cambium after the primary growth. It is the main component of wood in trees and shrubs. Secondary xylem is formed during the later stages of growth, especially during the winter months when cambial activity is high. Therefore, this is the correct answer.

3. **Secondary Phloem**: This is the phloem produced by the vascular cambium, which is responsible for the transport of nutrients. While it is important for the plant, it does not constitute wood.

4. **Cambium**: This is a layer of tissue that produces secondary xylem and secondary phloem. It is not wood itself but is involved in the formation of wood.

Based on this analysis, the answer to the question "Which of the following is known as wood?" is:

**Answer: Secondary Xylem (Option 2)**