Transport, mineral nutrition, photosynthesis, respiration, growth and development in plants.
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Q1 · Plant Physiology · MEDIUM
In a greenhouse experiment, plants were exposed to red light followed immediately by far-red light before dark period. Compared to plants exposed only to red light, what effect would this treatment have on flowering in short-day plants?
Q2 · Plant Physiology · HARD
In a C4 plant, the initial CO2 fixation occurs in mesophyll cells through the enzyme PEP carboxylase, forming a 4-carbon compound. This compound is then transported to bundle sheath cells where CO2 is released and enters the Calvin cycle. What is the primary advantage of this pathway over C3 photosynthesis?
Q3 · Plant Physiology · HARD
In C4 plants, the primary CO₂ acceptor in mesophyll cells is phosphoenolpyruvate (PEP), and the first stable product is a 4-carbon compound. Which enzyme catalyzes this initial fixation step, and what is the 4-carbon product formed?
Q4 · Plant Physiology · MEDIUM
Photorespiration in C3 plants occurs when RuBisCO enzyme binds with O₂ instead of CO₂. This process primarily occurs in which cellular compartments?