CHANGES IN ENVIRONMENT
- grow towards light to maximise absorption for photosynthesis
- roots sense gravity and grow in the right direction
- climbing plants have sense of touch so find things to climb to reach sunlight
RESPONSES TO HERBIVORY - TOXIC CHEMICALS
- Alkaloids - chemicals with bitter taste, bad smells or poisonous
- Tannins - bad taste and in some some herbivores (cattle, sheep) bind to protein in gut making plant hard to digest.
RESPONSES TO HERBIVORY - PHEROMONES
- alarm pheromones - causes nearby plants to detect chemicals and start making their own
- corn plants can produce pheromones to attract parasitic wasps that kill caterpillars eating them.
LEAF CURLING
- knocks of insects and scares away animals trying to eat
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