Pollen viability for rice and wheat plant is

Options

A. 30 hours
B. several months
C. `1//2` hour
D. 30 seconds

Answer

### Step-by-Step Solution:

1. **Understanding Pollen Viability**:
- Pollen viability refers to the ability of pollen grains to perform their function, which is to deliver male gametes to the embryo sac for fertilization.

2. **Function of Pollen**:
- The primary function of pollen is to enter the embryo sac and fertilize the female gametophytes. This process is crucial for sexual reproduction in flowering plants.

3. **Variability of Pollen Viability**:
- Pollen viability can vary significantly between different plant species. It is influenced by various factors, including the taxonomic status of the plant.

4. **Pollen Viability in Rice and Wheat**:
- For rice and wheat plants, the pollen viability is relatively short. Specifically, it has been noted that the pollen remains viable for approximately 30 minutes after being released from the anther.

5. **Evaluating the Options**:
- Given the options:
- 30 hours (incorrect)
- Several months (incorrect)
- Half hour (correct, as it is equivalent to 30 minutes)
- 30 seconds (incorrect)
- The correct answer is "half hour," which is equal to 30 minutes.

6. **Conclusion**:
- Therefore, the pollen viability for rice and wheat plants is 30 minutes.