Light and dark reactions, C3/C4/CAM pathways, photorespiration.
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Q1 · Photosynthesis (Class 11 — ~20% weight) · EASY
During the light-dependent reactions of photosynthesis, photolysis of water occurs in photosystem II. Which of the following is NOT a product of this photolysis?
Q2 · Photosynthesis (Class 11 — ~20% weight) · MEDIUM
In C4 plants, the first stable product of CO2 fixation is a 4-carbon compound. This initial fixation occurs in mesophyll cells. Which enzyme catalyzes this initial CO2 fixation in C4 plants?
Q3 · Photosynthesis (Class 11 — ~20% weight) · HARD
Photorespiration is considered a wasteful process in C3 plants because it reduces photosynthetic efficiency. Under which environmental condition does photorespiration increase significantly, and what is the primary reason?