Plant responses
Plant responses and causes
Plant responses and causes
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Lernkarten
What is a Plant growth regulator
Chemicals that control a particular development or response
Where are plant growth regulators produced
meristem
How are plant growth regulators transported
through vascular tissue
3 reasons why plant growth regulators were difficult to discover
1. active in Small amounts,
2. Effects depend on concentration,
3. Do not act where they are produced
Plant growth regulator with negative effect on growth
ethene or abscisin
Uses of artificial growth regulators
Rooting powder,
weed killer,
ripening of fruit
how do auxins help phototropism
they move to shaded part of the stem and cause cell elongation so that the shoot grows towards the light
IAA experiment results
low concentration = roots grow;
high concentration = shoots grow;
very high concentration = nothing grows
Name 5 tropisms and the stimulus
1. Geotropism - gravity
2. Phototropism- light
3. Thigmotropism- touch
4. Hydrotropism- water
5. Chemotropism- chemicals
plant defences and adaptations
Spines (modified leaves- cacti)
Thornes
Stinging hairs (nettles)
Wax
Bark
