The pollen grain viability is highly variable Select the least viable pollen grain from the following list of choices.

Options

A. Peas
B. rose
C. potatoes
D. rice

Answer

To determine the least viable pollen grain from the given options, we need to analyze the viability of pollen grains in different plant families. Here’s a step-by-step solution:

### Step 1: Understand Pollen Grain Viability
Pollen grain viability refers to the duration for which pollen grains remain capable of germinating after being released from the anther. This duration can vary significantly among different plant species.

**Hint:** Remember that viability is the time period during which pollen can effectively participate in fertilization.

### Step 2: Identify Key Plant Families
We need to consider the examples provided in the video transcript:
- **Fabaceae (Leguminous plants)**: Generally have high pollen viability, often lasting for months.
- **Rosaceae (Rose family)**: Also shows high pollen viability, typically lasting for months.
- **Solanaceae (Potato family)**: Similar to the previous two, with good viability over months.
- **Cereals (Grasses)**: Specifically, rice and wheat have very low pollen viability, often less than 30 minutes.

**Hint:** Compare the viability of pollen grains from different families to identify the one with the least viability.

### Step 3: Analyze the Options
From the information provided:
- **Peas (Fabaceae)**: High viability.
- **Rose (Rosaceae)**: High viability.
- **Potato (Solanaceae)**: High viability.
- **Rice (Cereals)**: Very low viability, less than 30 minutes.

**Hint:** Focus on the cereals, as they are mentioned to have the least viability.

### Step 4: Conclusion
Based on the analysis, the least viable pollen grain among the options provided is from **rice (Oryza sativa)**, as its pollen grains remain viable for only about half an hour after release.

**Final Answer:** The least viable pollen grain is **rice**.