The reason of formation of embryoid from pollen grain in a tissue culture medium is

Options

A. Cellular totipotency
B. Organogenesis
C. Double fertilization
D. Test tube culture

Answer

To answer the question regarding the reason for the formation of embryoids from pollen grains in a tissue culture medium, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Pollen Grain**:
- Pollen grains are male gametophytes in flowering plants. They consist of a single cell that can undergo division and differentiation.

**Hint**: Remember that pollen grains are crucial for plant reproduction and contain the male genetic material.

2. **Totipotency Concept**:
- Totipotency refers to the ability of a single cell to develop into a complete organism. In plants, certain cells, including pollen grains, exhibit this characteristic.

**Hint**: Think of totipotency as the potential of a single cell to become an entire plant.

3. **Tissue Culture Medium**:
- In a suitable tissue culture medium, the conditions are optimized (such as nutrients, hormones, and environmental factors) to encourage cell division and differentiation.

**Hint**: Tissue culture provides a controlled environment that mimics natural growth conditions for plant cells.

4. **Formation of Embryoids**:
- When pollen grains are placed in a suitable tissue culture medium, they can undergo division and differentiation, leading to the formation of embryoids. This process is a manifestation of their totipotent nature.

**Hint**: Embryoids are structures that resemble embryos and can develop into new plants.

5. **Conclusion**:
- The primary reason for the formation of embryoids from pollen grains in tissue culture is their inherent totipotency, allowing them to develop into whole new organisms under appropriate conditions.

**Hint**: Focus on the concept of totipotency as the key factor in this process.

### Final Answer:
The reason for the formation of embryoids from pollen grains in a tissue culture medium is due to their totipotency, which allows these single cells to develop into a complete organism.