What distinguishes C₄ plants from C₃ plants?

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C₄ plants ﬁx ${CO}_{2}$ exclusively through the C₄ pathway, while C₃ plants use only the Calvin cycle.

Both C₄ and C₃ plants use the Calvin cycle as their main biosynthetic pathway, but C₄ plants initially ﬁx ${CO}_{2}$ into a four-carbon compound, oxaloacetic acid.

C₃ plants are adapted to dry tropical regions, whereas C₄ plants are not.

C₄ plants have a higher rate of photorespiration compared to C₃ plants.

answer is B.

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Detailed Solution

While both C₄ and C₃ plants utilize the Calvin cycle as their primary biosynthetic pathway, C₄ plants first fix carbon dioxide into a four-carbon compound known as oxaloacetic acid. C₄ plants are adapted to dry tropical regions. C₄ plants show no photorespiration.

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