In which one pair both the plants can be vegetatively propagated by leaf?

Options

A. Bryophyllum and Kalanchoe
B. Chrysanthemum and Agave
C. Agave and Kalanchoe
D. Asparagus and Bryophyllum

Answer

To solve the question of which pair of plants can be vegetatively propagated by leaf, we will analyze the options provided and understand the process of vegetative propagation through leaves.

### Step-by-Step Solution:

1. **Understanding Vegetative Propagation by Leaf**:
- Vegetative propagation by leaf occurs when leaves can produce new plants. This typically involves the formation of plantlets on the leaf margins or surfaces, which can eventually detach and grow into new plants.

2. **Analyzing the Options**:
- **Option 1: Dryophyllum and Calanchie**:
- Calanchie (more commonly known as Kalanchoe) is known for its ability to propagate through leaves, where plantlets form along the leaf edges. However, Dryophyllum is not a recognized plant for this method of propagation.

- **Option 2: Chrysanthemum and Agave**:
- Chrysanthemum can be propagated through cuttings but does not typically propagate through leaves. Agave does not propagate through leaves either; it primarily reproduces through offsets or bulbils.

- **Option 3: Agave and Calanchie**:
- As mentioned, Agave does not propagate through leaves, while Calanchie does.

- **Option 4: Asparagus and Dryophyllum**:
- Asparagus primarily propagates through crowns or seeds, and Dryophyllum does not propagate through leaves.

3. **Identifying the Correct Pair**:
- The only pair where both plants can be vegetatively propagated by leaves is **Bryophyllum and Calanchie**. Bryophyllum is well-known for producing plantlets along its leaf margins, and Calanchie also propagates in a similar manner.

4. **Final Answer**:
- The correct answer is **Bryophyllum and Calanchie**.