Read the statements about ethylene given below and select the statements that are correct.
a. Ethylene is a simple gaseous PGR.
b. Ethylene breaks seed & bud dormancy.
c. Ethylene is used to initiate flowering .
d. Ethylene promotes root growth & root hair formation .

Options

A. b,c, and d are correct
B. Only 'a' is correct
C. b and d are correct
D. a , b , c and d are correct

Answer

To determine which statements about ethylene are correct, let's analyze each statement one by one based on our knowledge of ethylene as a plant growth regulator (PGR).

### Step-by-Step Solution:

1. **Statement a: Ethylene is a simple gaseous PGR.**
- Ethylene is indeed a gaseous plant growth regulator. It is one of the simplest hormones and is known for its role in various plant processes.
- **Conclusion:** This statement is **correct**.

2. **Statement b: Ethylene breaks seed & bud dormancy.**
- Ethylene is known to break dormancy in seeds and buds, allowing them to germinate or grow. This is an important function of ethylene in plant development.
- **Conclusion:** This statement is **correct**.

3. **Statement c: Ethylene is used to initiate flowering.**
- Ethylene can indeed initiate flowering in certain plants. For example, it is known to promote flowering in mangoes and other species.
- **Conclusion:** This statement is **correct**.

4. **Statement d: Ethylene promotes root growth & root hair formation.**
- Ethylene does promote root growth and the formation of root hairs, which increases the surface area for absorption.
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
All four statements about ethylene are correct.