Which of the following is a component of coenzyme A, vitamin biotin, thiamine and mustard oil and whose deficiency results in decrease in nodule formation is

Options

A. Cu
B. Ca
C. S
D. Mn

Answer

To solve the question regarding which component is associated with coenzyme A, vitamin biotin, thiamine, and mustard oil, and whose deficiency leads to a decrease in nodule formation, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components**: The question lists several compounds: coenzyme A, vitamin biotin, thiamine, and mustard oil. We need to determine which mineral element is a part of these compounds.

2. **Analyze the Options**: The options provided are copper, calcium, sulphur, and manganese. We need to evaluate each option to see if it is a component of the listed compounds.

3. **Research Each Option**:
- **Copper**: While essential for plant growth, it is not a component of coenzyme A, biotin, thiamine, or mustard oil.
- **Calcium**: Important for plant structure and function, but not a direct component of the mentioned compounds.
- **Sulphur**: Known to be a component of amino acids (methionine and cysteine) and is essential in the formation of coenzyme A, biotin, and thiamine. It is also involved in the synthesis of mustard oil.
- **Manganese**: Plays a role in photosynthesis and enzyme function but is not a component of the listed compounds.

4. **Determine the Deficiency Effects**: The question specifies that the deficiency of the correct answer results in decreased nodule formation. Sulphur deficiency is known to affect nodule formation in legumes, which is critical for nitrogen fixation.

5. **Conclusion**: Based on the analysis, the correct answer is **sulphur**. It is a component of coenzyme A, vitamin biotin, thiamine, and mustard oil, and its deficiency leads to decreased nodule formation.

### Final Answer:
The correct answer is **sulphur**.

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