Question:
The organelles which take part in photo-respiration are
The organelles which take part in photo-respiration are
Updated On: Jul 7, 2022
- chloroplast, mitochondria, nucleus
- chloroplast, mitochondria, lysosome
- mitochondria, chloroplast, peroxisome
- mitochondria, lysosomes, peroxisome
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The Correct Option is C
Solution and Explanation
The process of photorespiration requires 3 cell organellesmitochondria, chloroplasts and peroxisomes. In chloroplasts glycolate is formed from ribulose biphosphate which passes into peroxisomes to be changed into glyoxylate. In this reaction $H_2O_2$ is evolved. Glyoxylate is changed to glycine which now enters mitochondria. Two molecules of glycine combine to form one molecule of serine with the evolution of $CO_2$.
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Notes on Photorespiration
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.