Question:
Dark reaction in photosynthesis is called so because
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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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)