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Practice question

Question

In long day plants, flowering is promoted by:

Options

Choose one · Correct answer highlighted

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.