Ethephon hastens the fruit ripening in tomatoes and apple and accelerates abscission in flowers and fruits. Above statement indicates that ethephon must release -

Options

A. ABA
B. `C_2 H_4`
C. `IA A`
D. `GA_7`

Answer

To answer the question regarding ethephon and its role in hastening fruit ripening and accelerating abscission in flowers and fruits, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Ethephon**: Ethephon is a plant growth regulator that is known to release ethylene when it decomposes. Ethylene is a gaseous plant hormone that plays a crucial role in various plant processes.

2. **Role of Ethylene in Ripening**: Ethylene is widely recognized for its role in promoting fruit ripening. It triggers the ripening process in fruits like tomatoes and apples, leading to changes in color, texture, and flavor.

3. **Role of Ethylene in Abscission**: In addition to promoting ripening, ethylene also accelerates the process of abscission, which is the shedding of flowers and fruits from the plant. This is important for the plant's reproductive cycle and resource allocation.

4. **Conclusion**: Since ethephon releases ethylene, it can be concluded that ethephon must release ethylene to hasten fruit ripening and accelerate abscission in flowers and fruits.

### Final Answer:
Ethephon must release **ethylene**.

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