Pollen grains of rice and wheat lose their viability in ....... minutes of their release

Options

A. 30
B. 10
C. 60
D. 90

Answer

To solve the question regarding the viability of pollen grains of rice and wheat, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks how long pollen grains of rice and wheat remain viable after their release.

2. **Identify the Key Information**: The viability of pollen grains can differ among various plant species. For rice and wheat, we need to find the specific time frame in which their pollen grains lose viability.

3. **Recall Relevant Information**: Based on biological studies, it is known that the viability of pollen grains for certain plants, including rice and wheat, is a specific duration.

4. **Determine the Viability Duration**: From the information provided, it is stated that the pollen grains of rice and wheat lose their viability in 30 minutes after their release.

5. **Select the Correct Answer**: Given the options (30, 10, 60, or 90 minutes), the correct answer is 30 minutes.

### Final Answer:
Pollen grains of rice and wheat lose their viability in **30 minutes** of their release.

---