Mrs. Wright (who is always right, just ask her), is caring for her son's prize tomato plants while he attends a Tomatologist Conference.

She brings them into the house due to a pending ice storm and places them in a dark room. She provides plenty of water and soil nutrients, but does not turn on the lights to conserve energy.

Which of the following is most likely to occur first?

a
Calvin cycle will continue fas long as the products from the light dependent cycle and CO2 are available.
b
Fermentation will begin in the chloroplasts of the leaf cells.

1 answer

a
Calvin cycle will continue as long as the products from the light-dependent cycle and CO2 are available.

In the absence of light, photosynthesis cannot occur as it relies on sunlight as an energy source. However, the Calvin cycle, which is the second stage of photosynthesis, can still continue in the dark as long as it has the necessary products from the light-dependent cycle (ATP and NADPH) and CO2. This allows the plant to still produce glucose and other organic molecules necessary for its survival. On the other hand, fermentation does not occur in chloroplasts but rather in cytoplasm or specialized organelles called mitochondria.