1. Growth

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1. Growth response in plants

• Tropism
• Movement of part of a plant in response to an
  external stimulus

Positive growth is towards stimulus
Tropic responses
Negative growth is away from the stimulus
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• Growth
• 3 ways
• cell division
• cell enlargement
• cell differentiation (specialization)
• Plant growth substances (phytohormones)
• control growth and development of plant
• 4 types
• auxins
• gibberellins
• cytokinins
• ethene (ethylene)