Cytokinin is not found in

Options

A. Root apex
B. Shoot apex
C. Young fruits
D. Mature fruits.

Answer

**Step-by-Step Solution:**

1. **Understanding Cytokinins:**
- Cytokinins are plant hormones that play a crucial role in cell division, particularly in the process of cytokinesis, which is the division of the cytoplasm during cell division.

2. **Identifying Active Growth Areas:**
- Cytokinins are primarily found in areas of the plant where active cell division occurs. These areas include:
- Root apical meristem (RAM)
- Shoot apical meristem (SAM)
- Young fruits and buds

3. **Analyzing the Role of Cytokinins:**
- In the root and shoot apical meristems, cytokinins promote cell division and growth. In young fruits, they help in the development and maturation of the fruit.

4. **Considering Mature Fruits:**
- As fruits mature, the need for cell division decreases. Mature fruits do not require cytokinins because they are no longer actively dividing. Instead, they may have higher levels of other hormones, such as ethylene, which is involved in fruit ripening.

5. **Conclusion:**
- Therefore, the correct answer to the question "Cytokinin is not found in" is **mature fruits**. This is because mature fruits do not have the same requirement for cell division as younger tissues.

**Final Answer:**
Cytokinin is not found in mature fruits.

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