Cut-pieces of a Bryophyllum leaf, when put into wet soil, produce new plants. This phenomenon is called as

Options

A. Vegetative propagation
B. Tissue culture
C. Leaf primordial culture
D. Meristem culture

Answer

To solve the question regarding the phenomenon observed in Bryophyllum leaves, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bryophyllum**: Bryophyllum is a plant known for its ability to reproduce vegetatively. It has unique characteristics, particularly in its leaves.

2. **Identifying the Structure**: The leaves of Bryophyllum have notches along their margins. These notches are crucial because they contain adventitious buds.

3. **Role of Adventitious Buds**: These adventitious buds have the potential to develop into new plants. When the cut pieces of the Bryophyllum leaf are placed in wet soil, these buds can grow roots and stems.

4. **Process of Plant Formation**: Once in contact with the soil, the buds begin to grow, leading to the formation of new plants. This process does not require seeds or flowers, which is a key characteristic of vegetative reproduction.

5. **Defining the Phenomenon**: The process described above, where new plants are produced from parts of the parent plant (in this case, the leaf cuttings), is known as vegetative propagation.

6. **Differentiating from Other Methods**: Other options like tissue culture, leaf primordial culture, and meristem culture refer to in vitro methods of plant propagation, which occur in controlled laboratory conditions, unlike vegetative propagation that occurs naturally.

### Conclusion:
The phenomenon where cut pieces of a Bryophyllum leaf produce new plants when placed in wet soil is called **vegetative propagation**.

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