Question

The $C_4$ plants differ from $C_3$ plants with respect to the

• A. Substance that accepts $C{O}_2$ in carbon assimilation.
• B. Type of end product.
• C. Type of pigment involved in photosynthesis.
• D. Number of ATP that is consumed in preparing sugar.

Answer 1

The correct option is A Substance that accepts $C{O}_2$ in carbon assimilation.

The C${}_4$ plants differ from C${}_3$ plants with reference to the substrate that accepts CO${}_2$ in carbon assimilation. In the C${}_3$ plants, CO${}_2$ is assimilated by condensing with RuBP by the help of RuBisCO enzyme to yield the first stable product, three carbon compund PGA. In C${}_4$ plants, CO${}_2$ is assimilated by condensing with PEP, by the help of PEPCase enzyme to yield the first stable product, four carbon compound OAA.