plant hormones n.
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Plant Hormones. Plant growth regulators. What does a plant need to respond to in its environment?. Light Water Gravity. Positively phototrophic. Positively geotrophic. Positively hydrotrophic. How are plant growth factors different from animal hormones?.

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plant hormones

Plant Hormones

Plant growth regulators

what does a plant need to respond to in its environment
What does a plant need to respond to in its environment?
  • Light
  • Water
  • Gravity

Positively phototrophic

Positively geotrophic

Positively hydrotrophic

how are plant growth factors different from animal hormones
How are plant growth factors different from animal hormones?
  • They exert an influence by affecting growth
  • Produced and released by cells through out the plant rather than organs.
  • They affect the tissues or nearby tissues that release them, not distant target organs.
examples
Examples
  • Auxin – effects growth of the plant – example = IAA (the one you need to know about.
  • Cytokinins - growth control in fruit
  • Ethylene - promote ripening on the tree
  • Gibberellins – promote seed germination
experiments
Experiments
  • What doe these prove?