Which of the following processes does not occur in animal cells?

Options

A. Photosynthesis
B. Respiration
C. Excretion
D. Osmosis

Answer

**Step-by-Step Solution:**

1. **Identify the Processes Listed**: The question asks which process does not occur in animal cells. The options provided are:
- Photosynthesis
- Respiration
- Excretion
- Osmosis

2. **Analyze Each Process**:
- **Photosynthesis**: This process occurs in plant cells, where they use sunlight to convert carbon dioxide and water into glucose and oxygen. Animal cells do not have chloroplasts, which are necessary for photosynthesis.
- **Respiration**: This is a process that occurs in both plant and animal cells. It involves the intake of oxygen and the release of carbon dioxide, as cells convert glucose into energy.
- **Excretion**: This process involves the removal of waste products from the body and occurs in animal cells. It is essential for maintaining homeostasis.
- **Osmosis**: This is the movement of water across a semi-permeable membrane and occurs in both plant and animal cells. It is crucial for maintaining cell turgor and overall cell function.

3. **Determine the Correct Answer**: Based on the analysis:
- Photosynthesis does not occur in animal cells.
- Respiration, excretion, and osmosis do occur in animal cells.

Thus, the process that does not occur in animal cells is **photosynthesis**.

**Final Answer**: Photosynthesis

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