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what do gibberellins do
Seed germination and regulate plant height via stem growth
They can cause elongation by increasing length of the internodes (regions between leaves on the stem)
What does auxin regulate
Directional responses
Apical dominance
Cell differentiation and expansion
What triggers lead abscission in deciduous trees
Lengthening of dark periods meaning reduced photosynthesis rates
When the energy needs for respiration outweigh rh glucose availability due to that rate
The need for dormancy to stop and protect from winter related damage
What are some plant physical defences
Thorns barbs and spikes
Tough tissue so is hard to chew and digest
Stinging hairs to release irritants into herbivores
Why is using ethene good
It ensures all fruit ripens uniformly
Reduces damage and spoiling during transport
Makes sure the fruit gets to supermarkets in the ideal condition ready to eat
