Dormancy of seeds is broken by red light in

Options

A. gram
B. pea
C. lettuce
D. castor

Explanation

**Step-by-Step Solution:**

1. **Understanding Seed Dormancy**:
- Seed dormancy is a period during which seeds are inactive and do not germinate, even under favorable conditions. This dormancy can be broken by various environmental factors.

2. **Role of Light in Seed Germination**:
- Light is one of the critical factors that can influence seed germination. Some seeds require specific wavelengths of light to break dormancy and initiate germination.

3. **Specific Wavelengths of Light**:
- Different seeds respond to different wavelengths of light. For some seeds, exposure to red light is essential for breaking dormancy.

4. **Identifying the Type of Seeds**:
- The question specifically asks about which seeds have their dormancy broken by red light. The seeds that are known to respond positively to red light for germination are commonly referred to as "light-sensitive seeds."

5. **Conclusion**:
- Based on the information, the seeds that have their dormancy broken by red light are known as "lettuce seeds." Therefore, the answer to the question is "lettuce."

**Final Answer**: Lettuce seeds.

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