Question

$C_4$ photosynthesis does not occur in

• A. Zea mays
• B. Saccharum munja
• C. Saccharum officinarum
• D. Euphorbia splendens

Answer 1

The correct option is D Euphorbia splendens

Plants exhibiting characteristic kranz anatomy are $C_4$ plants. Spatial separation of carbon dioxide fixation and RUBISCO activity in mesophyll and bundle sheath cells of $C_4$ plants respectively avoids photorespiration by concentrating $C{O}_2$ in bundle sheath cells to scale down the oxygenase activity of RUBISCO and increase the RUBISCO efficiency. Zea mays and Saccharum spp are $C_4$ plant while Euphorbia splendens is a CAM plant that reduces water loss by opening the stomata at night only. So, the correct answer is option D.