9plant growth substances

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Across
  1. 4. The process by which a seed begins to grow and develop into a new plant.
  2. 6. A chemical substance that regulates growth and development in plants or animals.
  3. 9. The growth movement of a plant toward or away from light.
  4. 10. A substance that slows down or prevents a biological process.
Down
  1. 1. A plant hormone that promotes stem elongation and seed germination.
  2. 2. A plant hormone that controls cell elongation and growth direction.
  3. 3. The increase in size or number of cells in an organism.
  4. 5. The natural detachment of leaves, fruits, or flowers from a plant.
  5. 7. The mature ovary of a flower that contains seeds.
  6. 8. A hormone that stimulates cell division and delays leaf aging.