Cytokinins were discovered as

Options

A. Ethylene
B. Abscisic acid
C. Ethanol
D. Kinetin

Answer

To solve the question "Cytokinins were discovered as," we need to follow these steps:

### Step-by-Step Solution:

1. **Understanding Cytokinins**:
- Cytokinins are a class of plant hormones that play a crucial role in promoting cell division (cytokinesis) in plant roots and shoots.

2. **Historical Context**:
- The discovery of cytokinins was aimed at identifying factors that stimulate cell division in plants.

3. **Key Discovery**:
- The first cytokinin to be discovered was **kinetin**. This was derived from herring sperm DNA, which was autoclaved (sterilized) during the experiment.

4. **Scientists Involved**:
- The discovery of kinetin and, consequently, cytokinins was credited to scientists **Skoog and Miller**.

5. **Conclusion**:
- Therefore, the correct answer to the question is that cytokinins were discovered as **kinetin**.

### Final Answer:
Cytokinins were discovered as **kinetin**.

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