Question:

Dark reaction in photosynthesis is called so because

Updated On: Jul 6, 2022
  • it can occur in dark also
  • it does not directly depend on light energy
  • it cannot occur during day light
  • it occurs more rapidly at night
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The Correct Option is B

Solution and Explanation

Biosynthetic phase (dark or Blackman's reaction) catalyses assimilation of $CO_{2}$ to carbohydrates. The reactions are called carbon reactions.They occur in stroma of chloroplasts. The reactions do not require light. Instead assimilatory power ($ATP$ and $NADPH$) produced during photochemical phase is used in fixation and reduction of carbon dioxide. All the enzymes required for the process are present in the matrix or stroma of the chloroplast.
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Top Questions on Photosynthesis in higher plants

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Concepts Used:

Photosynthesis in Higher Plants

Processes Of Photosynthesis in Higher Plants:

Photosynthesis in higher plants involves the following processes:

  • Light Reaction
  • Dark Reaction

Light Reaction:

  • This phenomenon occurs in the presence of light.
  • The pigment absorbs light and produces energy in the form of ATP.
  • The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.

Dark Reaction:

This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:

  1. Calvin Cycle (C3 Cycle)
  2. C4 Cycle (Hatch and Slack Pathway)