Why is the calvin cycle considered a dark reaction? a. it occurs only at night. b. it requires an absence of light. c. it turns the plant dark green. d. it can proceed in the dark.

Answer is D. It can proceed in the dark. Took the test.

The correct answer would be d. It can proceed in the dark.

Calvin cycle or Benson-Calvin cycle refers to the set of chemical reactions involved in fixing the carbon from carbon dioxide into the sugar or glucose.

It generally occurs in the stroma of the chloroplast and does not require the input of solar energy that is, it can occur in dark. It is the reason that it is also termed as the dark reaction.

However, it depends on the products of light reaction which are NADPH and ATP.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.