Find odd one out w.r.t histogens found in shoot apex according to Hanstein

Options

A. Tunica
B. Periblem
C. Plerome
D. Dermatogen

Answer

To find the odd one out with respect to histogens found in the shoot apex according to Hanstein, we need to analyze the given options:

1. **Tunica**
2. **Pariblen**
3. **Plurome**
4. **Dermatogen**

### Step-by-Step Solution:

**Step 1: Understand the Histogens**
- Histogens are layers of cells in the shoot apex that give rise to different tissues in the plant. According to Hanstein's theory, there are specific histogens that contribute to the structure of the shoot apex.

**Step 2: Analyze Each Option**
- **Tunica**: This is the outermost layer of the shoot apex. It plays a role in the formation of the epidermis. However, it is also associated with Schindler's theory regarding root apical meristem.

- **Pariblen**: This is the middle layer of the shoot apex. It is responsible for forming the cortex and endodermis. This is consistent with Hanstein's classification.

- **Plurome**: This is the innermost layer of the shoot apex, contributing to the formation of the pericycle and pith. This is also part of Hanstein's classification.

- **Dermatogen**: This is another term for the outermost layer, which contributes to the epidermis. It is included in Hanstein's classification.

**Step 3: Identify the Odd One Out**
- The **Tunica** is the odd one out because, while it is part of the shoot apex, it is primarily associated with Schindler's theory rather than Hanstein's. The other three (Pariblen, Plurome, and Dermatogen) are all part of Hanstein's classification of histogens.

### Conclusion:
The odd one out with respect to histogens found in the shoot apex according to Hanstein is **Tunica**.

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