science word puzzle.

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Across
  1. 3. growing toward or away from light is phototropism, light sensing chemicals in plants helps detect light
  2. 6. immature diploid plant that develops from the zygote
  3. 7. energy storage molecule
  4. 10. female reproductive structure of a plant of a seed plant where the haploid egg develops
  5. 11. requires two parent organisms, when a plant's sperm combines with a plant's egg, zygote then grows into a new plant with genetic combination from both parents.
  6. 13. stimulate the ripening of fruit
  7. 15. when a portion of a plant develops into a separate new plant, new plant is genetically identical to the parent plant
  8. 16. that increase rate of cell division and cell elongation
  9. 17. occurs when pollen grain lands on a female reproductive structure of a plant that is the same species.
  10. 18. daughter cells produced from haploid structures
  11. 19. flower when exposed to light less than 10-12 hours of darkness.
  12. 20. flowerless and flowering
  13. 21. made up of embryo, its food supply and a protective covering.
Down
  1. 1. flowering not affected by hours of darkness.
  2. 2. any changes in an organism's environment that cause a response
  3. 4. ethylene
  4. 5. orms from tissue in male reproductive structure of a seed plant
  5. 8. response of a plant to touch is called thigmotropism, tendrils on a vine show positive, roots show negative.
  6. 9. substances that act as chemical messengers within plants
  7. 12. reproduction, most land plant grow from seeds
  8. 14. require 12 or more hours of darkness for flowering, poinsettia.