Question

Choose the correct statement:

• A. In alcohol fermentation more than seven percent of the energy in glucose is released
• B. Fermentation takes place under anaerobic condition in many prokaryotes
• C. NADH is oxidized to $NAD^{+}$ very vigorously in fermentation
• D. In electron transport chain ATP synthase is associated with the complex IV

Hint:

Fermentation is "low energy" and happens without oxygen (anaerobic).

Answer 1

The Correct Option is B

Step 1: Understand the question.
We must pick the one correct statement about fermentation and respiration. We test each option against simple textbook facts.

Step 2: Check the energy claim.
The first option says more than seven percent of glucose energy is released in alcohol fermentation. In truth, fermentation releases only a small part, less than seven percent, because most energy stays locked in alcohol. So this option is wrong.

Step 3: Check the anaerobic claim.
The second option says fermentation happens under anaerobic (no oxygen) conditions in many prokaryotes. This is correct. Many bacteria ferment when oxygen is missing.

Step 4: Check the NADH claim.
The third option says NADH is oxidised very vigorously in fermentation. This is not right. The slow handing over of NADH to make $NAD^{+}$ in fermentation is not described as vigorous. So this option is wrong.

Step 5: Check the ATP synthase claim.
The fourth option ties ATP synthase to complex IV. ATP synthase is a separate complex (often called complex V), not complex IV. So this option is wrong.

Step 6: Final choice.
Only the second statement holds true.
\[ \boxed{\text{Fermentation takes place under anaerobic condition in many prokaryotes}} \]