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Across
  1. 1. The active form of phytochrome that absorbs far-red light.
  2. 3. Plants that flower when nights are long.
  3. 4. Type of plant that grew tall but didn’t flower until winter — the Maryland
  4. 6. The pigment that helps plants sense light.
  5. 7. Scientists call florigen the “hidden ________” of flowering.
  6. 9. Hormone that signals plants when it’s time to flower.
Down
  1. 1. The process by which plants respond to changes in day length.
  2. 2. The vascular tissue that transports florigen.
  3. 5. The inactive form of phytochrome that absorbs red light.
  4. 8. Plants that flower when nights are short.