Biology
Grade-9
Easy
Question
Binding of _____________ molecule to RUBISCO initiates photorespiration.
- Water
- Oxygen
- Carbon dioxide
- Starch
Hint:
Photorespiration refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis
The correct answer is: Oxygen
- Some O2 does bind to RuBisCO and hence CO2 fixation is decreased. The RuBP binds with O2 to form one molecule of PGA (3C compound) and phosphoglycolate (2C compound ) in the pathway of photorespiration.
- So Oxygen is correct
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