Biology

The most likely cause of the phenomenon is enhanced activity of enzymes related to the light-independent reactions of photosynthesis.

In the Calvin cycle, carbon dioxide is fixed, and through a series of enzymatic reactions, glucose is synthesized. Excess glucose can be converted into starch and stored as starch granules in the chloroplasts. If the activity of enzymes related to the Calvin cycle is enhanced, more glucose will be produced, and as a result, more starch will be synthesized and stored as larger and more numerous starch granules.

The other options are incorrect:

Option A: This would likely affect the import and export of molecules, but it wouldn’t directly result in an increase in starch production.