Which of the following is incorrect about ethylene?

Options

A. Promotes root hair formation
B. It is natural and derivative of carotenoids
C. It increases the number of female flowers
D. It cause synchronisation of flowering and fruit set in pineapples

Answer

To determine which statement about ethylene is incorrect, we can analyze the physiological functions and characteristics of ethylene as a plant hormone.

### Step-by-Step Solution:

1. **Identify Ethylene**: Ethylene is a gaseous plant hormone that plays a significant role in various physiological processes in plants.

2. **List Physiological Functions of Ethylene**:
- **Seed Germination**: Ethylene promotes seed germination.
- **Fruit and Root Growth Development**: It aids in the growth of fruits and roots.
- **Abscission**: Ethylene is involved in the abscission (detachment) of leaves and fruits.
- **Senescence**: It plays a role in the aging process of leaves and flowers.
- **Ripening of Fruits**: Ethylene is known for its role in the ripening of fruits.
- **Generation of Female Flowers**: It helps in the production of female flowers in male plants.

3. **Evaluate the Options**:
- **Promotes Root Hair Formation**: This statement is incorrect; ethylene does not promote root hair formation.
- **Increases the Number of Female Flowers**: This statement is correct; ethylene does increase the number of female flowers.
- **Causes Synchronization of Flowering and Fruit Set in Pineapples**: This statement is also correct; ethylene is known to synchronize flowering and fruit set in pineapples.
- **Natural and Derivative of Carotenoids**: This statement is incorrect; ethylene is not derived from carotenoids.

4. **Conclusion**: The incorrect statements about ethylene are:
- It promotes root hair formation.
- It is a natural derivative of carotenoids.

### Final Answer:
The incorrect statements about ethylene are:
- It promotes root hair formation.
- It is a natural derivative of carotenoids.