Practice question
Question
In long day plants, flowering is promoted by:
Explanation
Correct option is B, Presence of Pfr. In PHOTOPERIODISM problems like this, the accurate statement is Presence of Pfr; the others are common mix-ups. Not these: A) Absence of Pfr; C) Low phytochrome; D) High Pr. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.