Why is the Calvin cycle referred fo as a dark reaction?

Answer 1

Because it is a light-independent process

The Calvin cycle is a stage in photosynthesis. Photosynthesis is the process in which plants convert light energy to chemical energy (sugars). There are two stages in photosynthesis:

Light reaction (the photo part)
Calvin cycle (the synthesis part)
Only the light reaction directly uses light. The Calvin cycle is fueled by products from the light reaction, but doesn't need light. Therefore it is called the dark reaction.

Note that both stages are interdependent (see image).

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Answer 2

Isabella Anderson

The Calvin cycle, which occurs in the stroma of chloroplasts and is the phase of photosynthesis that happens independently of light, is known as a "dark reaction" because it is not dependent on light in the same way as the reactions that occur in the thylakoid membrane.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.