1.Whether photorespiration would be present at low co2 concentration on ___c3cycle or __c4 cycle.
Option=high/negligible/sometimes
2.whether photorespiration would be present at high co2 concentrations in ___c3cycle or ___c4 cycle.
Option=high /negligible/sometimes.
3.temperature optimum in ___c3 cycle or ___c4 cycle.
Option=30-40/20-25/above 40
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