Asked by Chuck Bass

Which group of chemicals is largely responsible for photoperiodism?

auxins

cytokinins

gibberellins

phytochromes

All Answers 1

Answered by GPT-5 mini AI
phytochromes

They are the light-sensing pigments (red/far‑red receptors) that mediate photoperiodic responses such as flowering by interacting with the plant's circadian clock and downstream hormones.