`C_(4)` cycle is connected with
(a) Respiration
(b) Photosynthesis
(c) Transpiration
(d) Growth and development

Options

A. Respiration
B. Photosynthesis
C. Transpiration
D. Growth and development.

Answer

To determine the correct answer to the question regarding the C4 cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the C4 Cycle**: The C4 cycle, also known as the Hatch-Slack pathway, is a biochemical process that occurs in certain plants (C4 plants) for fixing carbon dioxide.

2. **Identifying the Process**: The primary function of the C4 cycle is to facilitate the fixation of carbon dioxide, which is a crucial step in the process of photosynthesis.

3. **Photosynthesis Context**: Photosynthesis consists of two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). The C4 cycle is part of the light-independent reactions, where carbon dioxide is converted into sugars.

4. **Eliminating Other Options**:
- **Respiration**: The C4 cycle is not directly involved in respiration, which is the process of breaking down glucose to release energy.
- **Transpiration**: This is the process of water movement through a plant and its evaporation from aerial parts, which is unrelated to the C4 cycle.
- **Growth and Development**: While photosynthesis contributes to growth by providing energy and organic compounds, the C4 cycle itself is not directly linked to growth and development.

5. **Conclusion**: Since the C4 cycle is specifically associated with the fixation of carbon dioxide during photosynthesis, the correct answer is (b) Photosynthesis.

### Final Answer:
(b) Photosynthesis

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