The primary function of large intestine in man is

Options

A. storage of waste matter only
B. extraction of water
C. digestion of undigested matter
D. absortion of all digested components

Answer

**Step-by-Step Solution:**

1. **Understanding the Role of the Large Intestine**: The large intestine is a crucial part of the digestive system. Its primary role is not to digest food but to process waste material that has not been absorbed by the small intestine.

2. **Identifying Functions**: The large intestine has several functions, including:
- Absorption of water and electrolytes.
- Storage of waste before excretion.
- Fermentation of undigested materials by gut bacteria.

3. **Evaluating Options**:
- **Storage of Waste Matter**: While the large intestine does hold waste temporarily, its primary function is not storage.
- **Extraction of Water**: This is a significant function of the large intestine. It reabsorbs water from the waste material, which helps in forming solid feces.
- **Digestion of Undigested Matter**: The large intestine does not primarily digest food; rather, it allows for some fermentation by bacteria.
- **Absorption of All Digested Components**: This is mainly the role of the small intestine, not the large intestine.

4. **Conclusion**: The primary function of the large intestine in humans is the extraction of water from the undigested food material, which is crucial for maintaining hydration and forming solid waste.

5. **Final Answer**: The primary function of the large intestine in man is the extraction of water.

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