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Glycolate induces opening of stomata in

1. presence of oxygen
2. low CO2 conc.
3. high CO2 conc.
4. absence of CO2

Correct answer: low CO2 conc.

Solution

Glycolate formation is associated with photorespiration, which becomes more prominent when CO2 is low relative to O2. Low CO2 inside the leaf promotes stomatal opening to allow more CO2 entry for photosynthesis.

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