Root of which plant contains a red pigment that has affinity for oxygen ?

Options

A. Carrot
B. Sonyabean
C. Mustard
D. Radish

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a plant whose root contains a red pigment that has an affinity for oxygen. This indicates that the pigment is likely involved in oxygen transport.

2. **Identifying the Options**: The options provided are:
- Carrot
- Soybean
- Mustard
- Radish

3. **Analyzing the Options**:
- **Carrot**: The root of the carrot is orange and does not contain a red pigment with an affinity for oxygen.
- **Soybean**: The roots of soybean plants, particularly in leguminous plants, contain root nodules that have a red pigment known as leghemoglobin. This pigment has a high affinity for oxygen, which is essential for nitrogen-fixing bacteria in the nodules.
- **Mustard**: The root of mustard does not have a red pigment associated with oxygen transport.
- **Radish**: Similar to carrot, the radish root is not red and does not contain a pigment with an affinity for oxygen.

4. **Conclusion**: Based on the analysis, the correct answer is **Soybean**. The red pigment in the soybean's root nodules is leghemoglobin, which helps in transporting oxygen.

**Final Answer**: The root of the soybean plant contains a red pigment that has an affinity for oxygen.

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