Question

Micronutrient associated with nitrogen metabolism is:

• A. Copper
• B. Zinc
• C. Boron
• D. Molybdenum

Hint:

Molybdenum (Mo):
- Cofactor for nitrate reductase and nitrogenase.
- Essential for nitrogen metabolism.
- Deficiency: Whiptail in cauliflower.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
This question tests knowledge of micronutrients and their role in plant metabolism.

Step 2: Detailed Explanation:
Molybdenum (Mo) is a micronutrient essential for nitrogen metabolism in plants.
It is a cofactor for two key enzymes:
- Nitrate reductase: Reduces nitrate (NO$_3^-$) to nitrite (NO$_2^-$).
- Nitrogenase: Involved in biological nitrogen fixation (in legumes).
Copper (A): Involved in electron transport and photosynthesis.
Zinc (B): Involved in auxin synthesis and enzyme activation.
Boron (C): Involved in cell wall formation and carbohydrate transport.
Thus, molybdenum is associated with nitrogen metabolism.

Step 3: Final Answer:
Thus, molybdenum is the micronutrient associated with nitrogen metabolism, which corresponds to option (D).
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