When Plants Are Initially Exposed to Elevated Carbon Dioxide Levels

question 1

Multiple Choice

When plants are initially exposed to elevated carbon dioxide levels most increase their rate of photosynthesis; how might plant communities be affected?

• A)no changes other than increased NPP
• B)competition increases for other resources such as sunlight or phosphorus with the eventual disappearance of some community members
• C)community members decrease in size over time with the removal of the selection pressure for carbon dioxide acquisition
• D)Because carbon dioxide is never a limiting factor like water, nitrogen, or phosphorus, increased levels typically have no significant effects.

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