Plant responses

Plant responses and causes

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Flashcards	10
Language	English
Category	Biology
Level	Secondary School
Created / Updated	09.11.2016 / 10.11.2016
Weblink	https://card2brain.ch/box/plant_responses_
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What is a Plant growth regulator

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Chemicals that control a particular development or response

Where are plant growth regulators produced

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meristem

How are plant growth regulators transported

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through vascular tissue

3 reasons why plant growth regulators were difficult to discover

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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

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ethene or abscisin

Uses of artificial growth regulators

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Rooting powder,

weed killer,

ripening of fruit

how do auxins help phototropism

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they move to shaded part of the stem and cause cell elongation so that the shoot grows towards the light

IAA experiment results

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low concentration = roots grow;

high concentration = shoots grow;

very high concentration = nothing grows

Name 5 tropisms and the stimulus

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1. Geotropism - gravity

2. Phototropism- light

3. Thigmotropism- touch

4. Hydrotropism- water

5. Chemotropism- chemicals

plant defences and adaptations

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Spines (modified leaves- cacti)

Thornes

Stinging hairs (nettles)

Wax

Bark

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Plant responses

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