Question:

Dark reactions are called biosynthetic phase of photosynthesis. Dark reactions do not directly depend on the presence of light but are dependent on the products of the light reaction, i.e., $ATP$ and $NADPH$.

Updated On: Jul 6, 2022
  • If both assertion and reason are true and reason is the correct explanation of assertion
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is B

Solution and Explanation

Photosythesis occurs in two phases: photochemical and biosynthetic. Photochemical phase is also called light or hill reaction. Biosynthetic phase is also called as dark or Blackman's reaction. Dark reaction catalyses assimilation of $CO_{2}$ to carbohydrates. They occur in stroma or matrix of chloroplasts. These reactions do not require light directly but depend on assimilatory power ($ATP$ and $NADPH$) produced during light reaction.
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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)