Sagebrush Is a C4 Plant,while Wheat Is a C3 Plant

question 35

Multiple Choice

Sagebrush is a C4 plant,while wheat is a C3 plant.Based on the type of photosynthesis that would occur in these plants in an arid (dry) southern region of the United States,which of the following is true?

• A)Sagebrush is expected to outcompete wheat in the cooler spring and early summer seasons,whereas wheat outcompetes sagebrush in the hotter mid-to-late summer.
• B)Wheat is expected to outcompete sagebrush in the cooler spring and early summer seasons,whereas sagebrush outcompetes wheat in the hotter mid-to-late summer.
• C)Sagebrush produces 4 molecules of G3P per 'turn' of the Calvin cycle,while wheat produces only 3 molecules of G3P per "turn" of the Calvin cycle.
• D)Sagebrush carries out the initial fixation of CO₂ into an organic acid only at night.
• E)Wheat carries out the initial fixation of CO₂ into an organic acid only at night.

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