Which of the following is the most efficient pathway to extract energy from sugar?

Question

a. fermentation
b. cellular respiration
c. photosynthesis
d. all of the above are equally efficient

Answer 1

B.
More energy (ATP) can be extracted from cellular respiration than from the other processes. Fermentation is anaerobic and cellular respiration is aerobic. Plants also use cellular respiration to produce energy out of sugars.

Answer 2

B.

a is wrong because fermentation doesn't extract too much of the energy.

c is wrong because photosynthesis MAKES glucose, it doesn't extract energy from glucose.