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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.
-If the power fails and the lights go dark, CO2 levels will ________.
A) rise as a result of both animal and plant respiration
B) rise as a result of animal but not plant respiration
C) remain balanced because plants will continue to fix CO2 in the dark
D) fall because plants will increase CO2 fixation
E) fall because plants will cease to respire in the dark

Question

Quizplus · Accepted Answer

Without the artificial light source, plants will not be able to photosynthesize and remove CO2 from the air. Both animals and plants will then respire and add to the carbon dioxide levels, causing them to rise.

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