Question

why second phase of photosynthesis is called as dark reaction? ​

Answer 1

Answer:

The Calvin cycle is also called the dark reactions or light-independent reactions because it's the part that doesn't need energy from the sun to happen. ... The cycle uses ATP and NADPH synthesized in the light-dependent reactions to drive its reactions forward

Answer 2

Answer:

Second phase of photosynthesis is called dark reaction because it is not directly dependent on light.

Explanation:

• Photosynthesis is a process of conversion of light energy into chemical energy. It occurs in two phases, a light phase and a dark phase.
• Light phase occurs in the thylakoid membranes and involve photolysis of water by light energy with the production of ATP and NADPH.
• The dark reaction uses the products of light reaction to fix CO₂ and  form a carbohydrate molecule, glucose via C₃ cycle or C₄ cycle.
• Since, the second phase does not utilize light energy directly, instead uses the product of light reaction it is called dark reaction.

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