Practice question
Question
Which form of phytochrome is biologically active?
Explanation
Go with B — Pfr. Under PHOTOPERIODISM, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Pr; C) Both; D) None. When two options sound similar, choose the one that matches the textbook definition most tightly.
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