Presence of PEP carboxylase in C₄ plants enables them to avoid photorespiration due to:
Correct answer: C. PEP carboxylase being strictly carboxylase
- A. Presence of enzyme in high concentration
- B. Absence of Rubisco
- C. PEP carboxylase being strictly carboxylase
- D. High yield of enzyme
Explanation
PEP carboxylase is an enzyme that plays a crucial role in the C4 photosynthetic pathway. It fixes CO2 into a 4-carbon compound, oxaloacetate, in the mesophyll cells of C4 plants. This enzyme is highly selective for CO2 and does not react with O2, which prevents oxygenation reactions and photorespiration. By avoiding photorespiration, C4 plants are able to conserve energy and maintain high photosynthetic efficiency, even in hot and dry environments.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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