Plant and animal responses

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Across
  1. 2. A plant which will only be induced to flower once the night length is longer than a critical period.
  2. 3. A rhythm with a period of approximately 29.5 days.
  3. 4. An internal timing mechanism (controlled by genes).
  4. 7. A response by an animal to a directional environmental stimulus. Must state whether it is positive or negative.
  5. 9. A plant growth response to a directional environmental stimulus. Controlled by auxin causing cell elongation.
  6. 11. A biological response to a change in the proportions of light and dark in a 24 hour cycle.
  7. 12. A reversible plant movement response to a non-directional environmental stimuli.Controlled by water movement.
  8. 14. The process by which the biological clock is kept in check with the environment, clock is entrained by a zeitgeber.
  9. 16. The repeated mass movement of a group resulting in greater reproductive success.Usually a return trip.
  10. 17. The ability of an animal to find its way home over unfamiliar territory.
  11. 20. A ranked order according to dominance with each member (except the alpha) being submissive to others.
  12. 22. The area which an animal marks and defends and which contains all the resources it needs to safely raise offspring.
  13. 23. A feeding relationship where both species benefit
  14. 24. This resets a biological clock and keeps the activity entrained to the changes in the environment.
  15. 25. A photoreceptor pigment involved in flowering-exists in two forms phytochrome red (P r ) and phytochrome far red (P fr ). P fr is the biologically active form.
Down
  1. 1. A plant which will only be induced to flower once the night length is shorter than a critical period.
  2. 3. A rhythm with a period of approximately 24 hours.
  3. 5. A response by an animal to a change in intensity of a diffuse (non-directional)environmental stimulus.
  4. 6. Includes predation, parasitism and herbivory
  5. 8. A feature which enables an organism to have some increased likelihood of reproductive success.
  6. 10. Can be intraspecific or interspecific. Both parties lose out somewhat.
  7. 13. A rhythm with a period of approximately 12.5 hours.
  8. 15. Rhythm Externally controlled (by environmental cues).
  9. 18. A means of orientation during migration –eg star patterns, using the sun as a compass, visual cues/landmarks, smell, major wind currents, major water currents.
  10. 19. The area in which an animal will roam (not marked or defended).
  11. 21. Rhythm Internally controlled (by genes).