Which of the following is correct about seed dormancy ?

Options

A. The seed dormancy can be overcome by subjecting the seeds to warm conditions or by application of certain chemicals like gibberellic acid and nitrites.
B. An external environment like an impermeable and hard seed coat is responsible for inducing seed dormancy .
C. The presence of chemical inhibitors such as phenolic acids and para - ascorbic acid are internal factors that induce dormancy.
D. More than one option is correct.

Answer

To solve the question regarding seed dormancy, let's analyze each option step by step:

1. **Understanding Seed Dormancy**: Seed dormancy is a state in which seeds are prevented from germinating even under favorable conditions. This is a survival mechanism that allows seeds to withstand unfavorable environmental conditions.

2. **Evaluating the Options**:
- **Option 1**: "Seed dormancy can be overcome by subjecting seeds to warm conditions or by application of certain chemicals like gibberellic acid and nitrites."
- **Analysis**: This statement is incorrect. While gibberellic acid can help break dormancy, warm conditions are not typically effective; rather, chilling conditions (cold stratification) are often required to overcome dormancy in many seeds.

- **Option 2**: "An external environment like an impermeable and hard seed coat is responsible for inducing seed dormancy."
- **Analysis**: This statement is misleading. While a hard seed coat can contribute to dormancy, it is not the only factor. Dormancy can also be influenced by internal factors, such as chemical inhibitors, and not solely by external conditions.

- **Option 3**: "The presence of chemical inhibitors such as phenolic acid, para-ascorbic acid are the internal factors that induce dormancy."
- **Analysis**: This statement is correct. Chemical inhibitors can indeed play a significant role in inducing seed dormancy by preventing germination even when external conditions are favorable.

- **Option 4**: "More than one option is correct."
- **Analysis**: Since only one statement (Option 3) is correct, this option is also incorrect.

3. **Conclusion**: The only correct statement regarding seed dormancy is Option 3.

### Final Answer:
The correct statement about seed dormancy is: "The presence of chemical inhibitors such as phenolic acid, para-ascorbic acid are the internal factors that induce dormancy."