If C4 Photosynthesis Prevents Photorespiration, Why Haven't All Plants Evolved

question 74

Multiple Choice

If C4 photosynthesis prevents photorespiration, why haven't all plants evolved to use the C4 pathway?

• A)All plants will evolve to be C4 in time.
• B)C4 produces some toxic by-products.
• C)C4 is not advantageous in all climates.
• D)Only some plants use C4 photosynthesis.
• E)C4 is advantageous in only high-oxygen habitats.

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