Why are C₄ plants able to photosynthesize with no apparent photorespiration?
A) They do not participate in the Calvin cycle.
B) They use PEP carboxylase to initially fix CO₂.
C) They are adapted to cold, wet climates.
D) They conserve water more efficiently.
E) They exclude oxygen from their tissues.

Question

Quizplus · Accepted Answer

C₄ plants use PEP carboxylase to initially fix CO₂, thus bypassing the need for Rubisco enzyme, which is responsible for photorespiration.

Answer: E 
 C₄ plants exclude oxygen from their tissues by carrying out the initial steps of photosynthesis in the mesophyll cells and the final steps in bundle sheath cells, where carbon dioxide is concentrated and oxygen is excluded, leading to no apparent photorespiration.

Why Are C₄ Plants Able to Photosynthesize with No Apparent