MDCAT Biology MCQ #185

In hot, dry conditions, C3 plants close their stomata, causing Rubisco to bind with oxygen instead of carbon dioxide. This process is known as:

MDCAT Biology MCQ #185

  1. Question 1

    Q1. In hot, dry conditions, C3 plants close their stomata, causing Rubisco to bind with oxygen instead of carbon dioxide. This process is known as:

    • A) Carboxylation
    • B) Reduction
    • C) Photorespiration
    • D) Regeneration

    Answer: Photorespiration

    Explanation: Rubisco acts as an oxygenase when CO2 levels are low and O2 is high, leading to the production of phosphoglycolate.