Question

Compared to C₃ plants, C₄ plants a. Can continue to fix CO₂ even at lower CO₂ concentrations and higher oxygen concentrations b. Have higher rates of photorespiration c. Do not use rubisco for carbon fixation d. Make a four-carbon compound, oxaloacetate, which is then delivered to the citric acid cycle in mitochondria

Answer 1

Compared to C₃ plants, C₄ plants: (a) Can continue to fix CO₂ even at lower CO₂ concentrations and higher oxygen concentrations.

C₄ plants get their name from the first product formed from CO₂ fixation, which is a four-carbon compound (oxaloacetate).

In C₄ plants, unlike C₃ plants, an alternate mode of carbon fixation is observed which tends to minimize photorespiration.

The first step in a C₄ pathway involves addition of CO₂ to phosphoenolpyruvate (PEP) by an enzyme, PEP carboxylase (present in the mesophyll cells) resulting in the formation of oxaloacetate.

The enzyme PEP carboxylase continues to function even at lower CO₂ concentrations as well as during relatively higher oxygen concentrations.

To learn more about photorespiration here

brainly.com/question/2560710

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