Stem tendrils (climbing in function) develop from axillary bud. Stem tendrils are in all of the following except-

Options

A. Cucumber
B. Citrus
C. Pumpkin
D. Watermelon

Answer

To solve the question regarding stem tendrils and their presence in various plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Stem Tendrils**:
- Stem tendrils are specialized structures that develop from the axillary buds of plants. They are typically thin, spirally coiled, and help the plant to climb by wrapping around supports.

2. **Identify the Function of Stem Tendrils**:
- The primary function of stem tendrils is to provide mechanical support to climbing plants, allowing them to reach sunlight and grow better.

3. **List the Plants Mentioned in the Question**:
- The question mentions several plants: Cucumber, Pumpkin, Watermelon, and Citrus.

4. **Determine Which Plants Have Stem Tendrils**:
- **Cucumber**: Has stem tendrils that help it climb.
- **Pumpkin**: Also has stem tendrils for climbing.
- **Watermelon**: Contains stem tendrils that assist in climbing.
- **Citrus**: Typically does not have stem tendrils; instead, they have a more upright growth habit.

5. **Conclusion**:
- Based on the analysis, stem tendrils are present in Cucumber, Pumpkin, and Watermelon, but they are absent in Citrus. Therefore, the answer to the question is Citrus.

### Final Answer:
Stem tendrils are present in all of the following except **Citrus**.