Multiple choice

Conditions helpful in photorespiration are:

  1. more O2 and less CO2

  2. less O2 and more CO2

  3. more temperature and less O2

  4. more humidity and less temperature

  5. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photorespiration occurs when RuBisCO binds O2 instead of CO2, which happens more under high O2 and low CO2 conditions. High temperature also promotes photorespiration by reducing CO2 solubility. Humidity affects transpiration but not directly photorespiration.

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