Question

$C_4$ plants can fix carbon dioxide efficiently even in

• A. Low $C{O}_2$ concentration
• B. Low temperature
• C. High $O_2$ concentration
• D. Low water concentration

Answer 1

The correct option is A Low $C{O}_2$ concentration

$C_4$ plants use a supplementary method of $C{O}_2$ uptake, which forms a 4-carbon molecule instead of the two 3-carbon molecules of the Calvin cycle. Hence, these plants are called $C_4$ plants. They can effectively fix carbon in low carbon dioxide concentration as they have kranz anatomy.