AAPR Orientation in time - plants

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Across
  1. 2. A period of greatly reduced growth and metabolic activity that helps an organism survive unfavourable conditions.
  2. 4. behaviour* A plant or animal response to seasonal changes in day and night length, such as flowering, breeding, migration or dormancy.
  3. 5. A day-night nastic movement, such as leaves closing at night, usually controlled by a circadian clock and entrained by light-dark cues.
  4. 7. A plant that flowers when the uninterrupted night is shorter than a critical length (equivalently, when day length is sufficiently long).
  5. 9. A light-sensitive plant protein that exists in two interconvertible forms, Pr and Pfr, and helps plants measure night length.
  6. 11. (red-absorbing phytochrome) The usually inactive form of phytochrome. It absorbs red light and is converted to Pfr.
  7. 14. The controlled shedding of a plant part, such as a leaf, flower or fruit; seasonal leaf abscission can reduce water loss and frost damage.
  8. 15. A plant whose flowering is not controlled by photoperiod.
Down
  1. 1. A plant that flowers when the uninterrupted night is longer than a critical length (equivalently, when day length is sufficiently short).
  2. 3. The threshold duration of uninterrupted night that determines whether a photoperiodic response, such as flowering, occurs.
  3. 6. The physiological response of an organism to the relative lengths of day and night.
  4. 8. The threshold duration of light that determines whether a photoperiodic response, such as flowering, occurs.
  5. 10. The promotion or competence for flowering after prolonged exposure to cold.
  6. 12. The relative durations of light and darkness in a 24-hour cycle.
  7. 13. (far-red-absorbing phytochrome) The usually biologically active form of phytochrome.