Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A) : Yeast is a facultative anaerobe.
Reason (R) : Yeast is an aerobic organism but in the absence of O₂ it can do anaerobic respiration.
In light of the above statements, choose the correct answer from the options given below.

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(A) is true but (R) is false.

Both (A) and (R) are false.

Both (A) and (R) are true but (R) is not the correct explanation of (A).

Both (A) and (R) are true and (R) is the correct explanation of (A).

answer is A.

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Detailed Solution

Assertion (A) is true. Yeast is a facultative anaerobe because it can carry out both aerobic and anaerobic respiration.

Reason (R) is correct. Yeast is aerobic and normally undergoes aerobic respiration in the presence of oxygen. However, when oxygen is absent, it can switch to anaerobic fermentation, such as alcoholic fermentation, to generate energy from sugars without using oxygen.

A and R are true and R is not the correct explanation of A.

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