Question

Given below are two statements
Statement I: Carbonic anhydrase localize in cytoplasm and chloroplast but does not facilitate CO2 fixation in plant under extreme lower concentration of Zn in plant system.
Statement II: Nitrite oxidoreductase and guanine aminoreductase activity is indicator of Mo status in plant.
In light of the above statements, choose the most appropriate answer from the options given below:

• A. Both Statement I and Statement II are correct
• B. Both Statement I and Statement II are incorrect
• C. Statement I is correct but Statement II is incorrect
• D. Statement I is incorrect but Statement II is correct

Hint:

Zinc functions:
- Carbonic anhydrase (CO2 hydration).
- Auxin synthesis (tryptophan).
- Protein synthesis.
Molybdenum functions:
- Nitrate reductase.
- Nitrogenase (N2 fixation).
- Sulfite oxidase.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question tests knowledge of micronutrient functions in plant metabolism.

Step 2: Detailed Explanation:
Statement I:
Carbonic anhydrase is a zinc-containing enzyme.
It is localized in the cytoplasm and chloroplasts.
It catalyzes the reversible hydration of CO2.
Under zinc deficiency (extremely low Zn), enzyme activity is reduced.
This affects CO2 fixation in plants.
This statement is true.
Statement II:
Nitrite oxidoreductase (also called nitrite reductase) is involved in nitrogen metabolism.
Guanine aminoreductase is not a standard enzyme name.
The activity of these enzymes is not an indicator of molybdenum (Mo) status.
Molybdenum is a cofactor for nitrate reductase and nitrogenase.
This statement is false.

Step 3: Final Answer:
Thus, Statement I is correct but Statement II is incorrect.
[0.5cm]