Question

Tropical plant like sugarcane show high efficiency of $C{O}_2$ fixation because of

• A. TCA cycle
• B. Calvin cycle
• C. Hatch and Slack cycle
• D. EMP pathway

Answer 1

Answer: (C)

Hatch and Slack cycle

Hatch and Slack pathway is the pathway which mainly prevents the association of enzyme RuBisCO with oxygen and increases the fixation of carbon dioxide by the enzyme. Tropical plants like sugarcane have high efficiency of carbon dioxide fixation as they have PEP carboxylase to capture carbon dioxide in the mesophyll cells and forms oxaloacetic acid (OAA). The OAA then converts into malate (4 carbons). Malate enters bundle sheath cells and releases the carbon dioxide to RuBisCO for fixation.

So, the correct answer is option C.