Question

Assertion (A): The exact chemical composition of complex microbial growth media is known.
Reason (R): Complex nutrient media is used when specific growth requirement of a microorganism is unknown.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

It is important to know the differences between defined and undefined media and their applications.

Answer 1

The Correct Option is D

Assertion (A): This assertion is incorrect. The exact chemical composition of complex microbial growth media is usually not fully known or defined. These media usually have complex mixtures of ingredients like extracts of yeast, meat, blood, peptones etc, and their composition is not clear. Reason (R): The reason is correct. Complex media are generally used when the specific growth requirements of the microorganism are unknown, as the complex mixtures in them provide a range of essential nutrients which allow them to grow. Explanation: Therefore, given that the assertion is incorrect, and the reason is correct, (D) is the correct option.