Which of the following plants does not help in vegetative propagation by leaves

Options

A. Begonia
B. Kalanchoe
C. Bryophyllum
D. Oxalis.

Answer

To determine which plant does not help in vegetative propagation by leaves, we will analyze each option given in the question.

### Step-by-Step Solution:

1. **Understanding Vegetative Propagation**:
- Vegetative propagation is a form of asexual reproduction in plants where new individuals are produced from the vegetative parts of the plant, such as leaves, stems, or roots.

2. **Analyzing the Options**:
- **Option A: Begonia**:
- Begonias can reproduce vegetatively through their leaves. They can produce new plants from leaf cuttings, making them capable of vegetative propagation by leaves.
- **Option B: Kalonji**:
- Kalonji (Nigella sativa) primarily reproduces through seeds and does not typically propagate vegetatively through leaves.
- **Option C: Bryophyllum**:
- Bryophyllum is well-known for its ability to propagate through its leaves. It can produce new plants from the leaf margins, which have buds that develop into new plants.
- **Option D: Oxalis**:
- Oxalis primarily propagates through bulbs, not leaves. The vegetative propagation occurs through the division of bulbs.

3. **Conclusion**:
- Based on the analysis, the plant that does not help in vegetative propagation by leaves is **Option D: Oxalis**.

### Final Answer:
**D. Oxalis**