Question

The essentiality of Molybdenum was discovered by

• A. A L Sommer and C P Lipman
• B. D I Arnon and P R Stout
• C. C Sprengle
• D. G Gris and P H Brown

Hint:

Micronutrient discoveries:
- Molybdenum: Sommer and Lipman (1938).
- Zinc, Mn, Cu: Arnon and Stout.
- Boron: Warington.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of the discovery of molybdenum as an essential plant nutrient.

Step 2: Detailed Explanation:
The essentiality of molybdenum for plants was discovered by A L Sommer and C P Lipman (A) in 1938.
Molybdenum is a micronutrient required for nitrate reductase and nitrogenase.
Other discoveries:
- D I Arnon and P R Stout (B): Discovered the essentiality of zinc, manganese, and copper.
- C Sprengle (C): Not related to molybdenum.
- G Gris and P H Brown (D): Not related to molybdenum.
Thus, Sommer and Lipman discovered molybdenum essentiality.

Step 3: Final Answer:
Thus, the essentiality of molybdenum was discovered by A L Sommer and C P Lipman, which corresponds to option (A).
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