Question:
Which of the following is the main production the photorespiration of $ {{C}_{3}} $ plants?
Which of the following is the main production the photorespiration of $ {{C}_{3}} $ plants?
Updated On: May 12, 2022
- Glycolate
- Glycerate
- Phosphoglycolate
- Phosphoglycerate
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The Correct Option is C
Solution and Explanation
Phosphoglycolate is the substrate for enzyme oxygenase. It is converted into glycolate which moves to adjacent peroxisome and converted into glyoxylate and further glycine. Glycinemoves to mitochondria in which by releasing $ C{{O}_{2}} $ it converts into 3-PGA which forms carbohydrate. Therefore, substrate phosphoglycolate is the main product in photorespiration.
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Concepts Used:
Photorespiration
Photorespiration is a wasteful process in plants in which plants intake oxygen, and sunlight and release carbon dioxide and no glucose is formed. Photorespiration generally takes place when the concentration of oxygen in the leaves is very high and that of carbon dioxide is very low.
In Calvin cycle carbon dioxide fixation does not take place . Hence, instead of carbon dioxide oxygen reacts with RuBP.
Photorespiration in C3 and C4 Plants:
- C4 plants do not undergo photorespiration due to their special mechanism to increase the CO2 level for enzyme binding.
- In Hatch and Slack Pathway, C4 acid and oxaloacetic acid breaks down to release CO2.
- This ensures a high concentration of intercellular CO2.
- Thus, in C4 plants, RuBisCO is more active as a carboxylase enzyme rather than as an oxygenase.
- This is why C4 plants have better productivity.