Question

In the absence of oxygen, plants will break down sugars into carbon dioxide and alcohols or acids. This pathway likely arose

• A. To get the most out phosphorylation per molecule of pyruvate without the ability to utilize respiration.
• B. As an alternative process to compete with respiration.
• C. To regenerate depleted NAD${}^{+}$.
• D. Because of human cultivation.

Answer 1

Answer: (C)

To regenerate depleted NAD${}^{+}$.

In absence of O${}_2$ respiration takes place anaerobically, for release of ATP as a result of this process NADH is converted to NAD${}^{+}$

So, the correct answer is 'To regenerate depleted NAD${}^{+}$'