Question : The substrate of photorespiration is
Option 1: Fructose
Option 2: Pyruvic acid
Option 3: Glycolate
Option 4: Glucose
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Correct Answer: Glycolate
Solution : The correct option is Glycolate.
The photorespiration substrate is glycolate, which is formed when RuBP (ribulose-1,5-bisphosphate) combines with oxygen rather than carbon dioxide during the first phases of photosynthesis. When there is an abundance of oxygen, the enzyme RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) binds to oxygen rather than carbon dioxide. This sets off a chain of events that result in the emission of carbon dioxide and the use of energy and resources, lowering photosynthetic efficiency.
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