Identify the tissue not formed during secondary growth in plants.

Options

A. phellogen
B. wood
C. phellem
D. pericycle.

Answer

To identify the tissue not formed during secondary growth in plants, follow these steps:

### Step-by-Step Solution:

1. **Understand Secondary Growth**: Secondary growth in plants is primarily associated with the increase in girth or thickness. This growth is facilitated by lateral meristems, which are also known as secondary meristems.

2. **Identify Lateral Meristems**: The two main types of lateral meristems involved in secondary growth are:
- **Cork cambium (Phellogen)**: This produces cork (Phelum) on the outer side and secondary cortex (Phalloderm) on the inner side.
- **Vascular cambium**: This produces secondary xylem (wood) and secondary phloem.

3. **Recognize the Tissues Formed**: During secondary growth, the following tissues are formed:
- **Cork (Phelum)**: Formed by cork cambium.
- **Secondary cortex (Phalloderm)**: Also formed by cork cambium.
- **Secondary xylem (Wood)**: Formed by vascular cambium.
- **Secondary phloem**: Also formed by vascular cambium.

4. **Identify the Non-formed Tissue**: Now, we need to identify which tissue is not formed during secondary growth.
- **Pericycle**: This is a part of the primary tissue, located just inside the endodermis, and is not involved in secondary growth. It is a primary meristematic tissue.

5. **Conclusion**: Based on the analysis, the tissue that is not formed during secondary growth is the **pericycle**.

### Final Answer:
The tissue not formed during secondary growth in plants is the **pericycle**.

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