Answer: Concentration gradient (happy to help)
Explanation: The particles may move along or against their concentration gradient.
Reactions that require carbon dioxide take place in the calvin cycle alone
Answer: Option D
<u>Explanation:</u>
Calvin cycle is an important cycle that plays a major role in the synthesis of starch through the photosynthesis. Calvin takes place as a part of the dark reaction in the stroma.
It is the calvin cycle that requires carbon dioxide. It uses the ATP that are produced by the light reaction that takes place in the thylakoid with the help of chlorophyll that traps the sunlight.
I am mostly sure the answer is B. Good luck, and sorry if it's wrong! :(
