can photosynthesis and cell respiration be put into reverse?

Question

since photosynthesis produces sugar and cell respiration uses sugar. how one process is the opposite of the other?

Answer 1

easy answer : NO, they are irreversibly pathways, the enzymes don't convert things back into substrates.

Answer 2

Plants are photosynthetic during the day when it's light outside. They make sugar from CO2 and water, and when they need energy they can break down the sugar via respiration.

At night, when it's dark, they can no longer photosynthesize. So they rely on all the sugar they produced during the day for energy until the sun comes up again.

Answer 3

Plants only respire to a small extent. Respiring alone isn't enough to produce the right volume of CO2 for making themselves food.

Answer 4

I wouldn't say they could be "put into reverse", but these processes are certainly complementary. What one process makes, the other process needs.

Photosynthesis makes glucose and oxygen; respiration uses glucose and oxygen.
Photosynthesis uses water and carbon dioxide; respiration makes water and carbon dioxide.
Photosynthesis stores energy in glucose molecules; respiration releases the energy from glucose molecules.

Answer 5

yeah but we'd all die.