Which of the following, pollen grains maintain their viability for months?

Options

A. Wheat, maize
B. Rice, wheat
C. Maize, rice
D. Tomato, bean

Answer

To determine which pollen grains maintain their viability for months, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Pollen Viability**: Pollen viability refers to the ability of pollen grains to germinate and fertilize ovules. Different plant species have varying durations of pollen viability.

2. **Identify Relevant Plant Families**: Some families of flowering plants are known for having pollen grains that can remain viable for extended periods. The families mentioned in the transcript are:
- Solanaceae (nightshade family)
- Leguminaceae (legume family)
- Rhoceaceae (a less commonly known family)

3. **Analyze the Options**: The question provides four options. We need to check which of these options includes plants from the families mentioned above.
- **Option A**: Wheat and Maize - These do not belong to the families listed and do not maintain viability for months.
- **Option B**: Rice and Wheat - Neither of these belongs to the families mentioned.
- **Option C**: Maize and Rice - Again, these do not belong to the families listed.
- **Option D**: Tomato and Beans - Tomato belongs to the Solanaceae family, and Beans belong to the Leguminaceae family.

4. **Conclusion**: Since Tomato and Beans are from the families known for maintaining pollen viability for months, the correct answer is **Option D: Tomato and Beans**.