Question

In $C_4$ plants, fixation of carbon dioxide occurs in

• A. Transfusion tissue
• B. Palisade tissue
• C. Cortex of stem
• D. Spongy mesophyll and bundle sheath cells.

Answer 1

Answer: (D)

Spongy mesophyll and bundle sheath cells.

Carbon dioxide from the atmosphere is accepted by phosphoenolpyruvic acid of mesophyll cells and converted into oxaloacetic acid and in bundle sheath cells it undergoes Calvin cycle by making a bond with RuBP which is present in its chloroplast.

So the correct option is 'Spongy mesophyll and bundle sheath cells'.