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A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Since the spaceship will be too far from the Sun for photosynthesis, an artificial light source will be needed.
-What would be the expected effect on plants if the atmospheric CO2 concentration was doubled?
A) All plants would experience increased rates of photosynthesis.
B) C3 plants would have faster growth; C4 plants would be minimally affected.
C) C4 plants would have faster growth; C3 plants would be minimally affected.
D) C3 plants would have faster growth; C4 plants would have slower growth.
E) Plant growth would not be affected because atmospheric CO2 concentrations are never limiting for plant growth.

Question

Quizplus · Accepted Answer

C3 and C4 plants have different mechanisms for photosynthesis, with C4 plants being better adapted to high CO2 concentrations. Doubling atmospheric CO2 concentrations would benefit C3 plants more than C4 plants, resulting in faster growth for C3 plants and minimal effect on C4 plants.

Use the Following Information to Answer the Question(s) Below