Differentiate between photorespiration and aerobic respiration.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
|
Feature |
Photorespiration |
Aerobic Respiration |
|
Site |
Green photosynthetic cells only |
All living cells (green and non-green) |
|
Light requirement |
Occurs only in light |
Continuous (light-independent) |
|
Organelles |
Chloroplasts, peroxisomes, mitochondria |
Mitochondria primarily |
|
Substrate |
Phosphoglycolate (from RuBP + O₂) |
Glucose, fatty acids, amino acids |
|
Energy production |
ATP consumed (wasteful) |
36-38 ATP produced per glucose |
|
Gas exchange |
O₂ consumed, CO₂ released |
O₂ consumed, CO₂ released |
|
Function |
No beneficial role (loss of fixed carbon) |
Essential energy generation |
|
Initiating enzyme |
RuBisCO (oxygenase activity) |
Multiple dehydrogenases |
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