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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Notes on Photosynthesis in higher plants

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:

Calvin Cycle (C3 Cycle)
C4 Cycle (Hatch and Slack Pathway)