Which among the following is not a function of cytokinis?

Options

A. Essential for cytokinesis during cell division
B. Delays the senescence of leaves
C. Helps in fruit ripening
D. Helps to overcome apical dominance

Explanation

To determine which among the following is not a function of cytokinins, we can follow these steps:

### Step 1: Understand Cytokinins
Cytokinins are a class of plant hormones that play a crucial role in various plant growth and developmental processes.

### Step 2: Identify Functions of Cytokinins
Cytokinins are known to:
- Promote cell division.
- Stimulate lateral shoot growth (lateral shoot elongation).
- Delay senescence (aging) of leaves.
- Act against apical dominance, which is primarily controlled by auxins.

### Step 3: Review the Given Options
We need to evaluate the provided options to identify which one does not align with the functions of cytokinins.

### Step 4: Analyze Each Function
- **Promotes cell division**: This is a known function of cytokinins.
- **Stimulates lateral shoot growth**: This is also a function of cytokinins.
- **Delays senescence**: Cytokinins are indeed involved in delaying leaf aging.
- **Helps in fruit ripening**: This function is not associated with cytokinins; instead, it is primarily the role of ethylene.

### Step 5: Conclusion
Based on the analysis, the function that is not associated with cytokinins is "helps in fruit ripening," which is the function of ethylene. Therefore, the correct answer is the option that states this.

### Final Answer
The function that is not a function of cytokinins is "helps in fruit ripening."

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