Question

Chrysanthemum, a major cut-flower and pot-plant crop, is photoperiodically classified as which type of plant, requiring artificial day-length manipulation (black-out treatment or supplemental lighting) for off-season flower production?

A Day-neutral plant, unaffected by photoperiod
B Short-day plant, requiring day length below a critical threshold
C Long-day plant, requiring day length above a critical threshold to flower
D A plant flowering only under continuous light
E A plant that never flowers under artificial light regardless of duration
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