LEAF STRUCTURE AND PHOTOSYNTHESIS

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Across
  1. 2. keeps a plant from going dry and helps it grow
  2. 4. collects rain water
  3. 9. a sweet crystalline substance
  4. 11. the orientation of a plant or other organism in response to light, either toward the source of light
  5. 13. a prosses plants go through to evolve
  6. 16. the physical energy resulting from electromagnetic radiation
  7. 17. comprised of the xylem and the phloem, the main transport systems of plants
  8. 18. the turning or bending of a plant or other organism in response to a touch stimulus
  9. 19. the beginning of a plant
  10. 20. an insect or other agent that conveys pollen to a plant and so allows fertilization
Down
  1. 1. made up of one carbon atom and two oxygen atoms
  2. 3. the growth of the parts of plants with respect to the force of gravity
  3. 5. Plants use the energy of the sun to change water and carbon dioxide into a sugar called
  4. 6. an essential component of photosynthesis
  5. 7. holds the atoms in a molecule together
  6. 8. gives plants energy
  7. 10. stems with secondary growth
  8. 12. a diatomic molecule that is composed of two oxygen atoms held together by a covalent bond
  9. 14. part of the plant that is in the ground
  10. 15. two hydrogen atoms, each linked by a single chemical bond to an oxygen atom