Question:
During photorespiration, the oxygen consuming reaction(s) occur in -
During photorespiration, the oxygen consuming reaction(s) occur in -
Updated On: Jul 18, 2024
- Stroma of chloroplasts
- Stroma of chloroplasts and mitochondria
- Stroma of chloroplasts and peroxisomes
- Grana of chloroplasts and peroxisomes
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The Correct Option is C
Solution and Explanation
Photorespiration is a process the rate of which increases under the influence of light, CO2, is released and O2 is used but no ATP is formed. It involves three organelles chloroplasts, mitochondria and peroxisomes. In chloroplast O2 is utilized as, ribulose biphosphate is oxidized and a molecule of phosphoglycolic acid and a molecules of 3-phosphoglyceric acid are formed. This oxidation takes place under the influence of high light intensity. Ribulose diphosphate carboxylase, an enzyme, facilitates this reaction as it behaves as an oxygenase. Only one molecule of oxygen is fixed here.
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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)