The cut flowers and vegetables are kept fresh for a long period by which of the following plant hormone ?

Options

A. Auxin
B. Gibberellin
C. Cytokinin
D. Ethylene

Answer

To determine which plant hormone keeps cut flowers and vegetables fresh for a long period, we can analyze the options provided:

1. **Auxin**: This hormone is primarily involved in the growth and elongation of cells, as well as the abscission (the process of shedding) of leaves and fruits. Therefore, it does not help in keeping cut flowers and vegetables fresh.

**Hint**: Think about the role of auxin in plant growth and development, and how it relates to the longevity of cut flowers.

2. **Gibberellins**: These hormones are known for their role in promoting growth, seed germination, and flowering. However, they do not specifically help in preserving the freshness of cut flowers and vegetables.

**Hint**: Consider the functions of gibberellins and whether they contribute to the preservation of cut plant materials.

3. **Cytokinins**: These hormones are known for their role in promoting cell division and delaying senescence (aging) in plants. They help in keeping cut flowers and vegetables fresh for a longer period by inhibiting the aging process.

**Hint**: Reflect on how cytokinins affect the lifespan of plant tissues and their role in delaying aging.

4. **Ethylene**: This hormone is involved in the ripening of fruits and can actually promote senescence in flowers and vegetables, leading to wilting and decay. Thus, it does not help in keeping them fresh.

**Hint**: Think about the effects of ethylene on fruit ripening and how it might negatively impact the freshness of cut flowers.

**Conclusion**: The correct answer is **Cytokinins** (Option 3), as they are the plant hormones that keep cut flowers and vegetables fresh for a long period.

### Summary of Steps:
1. Analyze each hormone's role in plant physiology.
2. Eliminate options based on their functions related to freshness.
3. Identify Cytokinins as the hormone that delays aging and maintains freshness.