MDCAT Biology MCQ #318

A plant is provided with optimal light and water but kept in an environment with 0.01% carbon dioxide. What happens to the rate of photosynthesis?

MDCAT Biology MCQ #318

  1. Question 1

    Q1. A plant is provided with optimal light and water but kept in an environment with 0.01% carbon dioxide. What happens to the rate of photosynthesis?

    • A) Increases rapidly
    • B) Becomes limited by CO2
    • C) Remains constant
    • D) Stops completely

    Answer: Becomes limited by CO2

    Explanation: If CO2 levels fall below the normal 0.03%, the rate of photosynthesis decreases as CO2 becomes limiting. It does not stop completely.