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Tropism
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Published on Nov 19, 2015
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PRESENTATION OUTLINE
1.
TROPISM
Zach Schrag
Photo by
Luke,Ma
2.
TROPISM DEFINITION
How an organism reacts in a particular direction in response to external stimulus.
Photo by
-nanio-
3.
POSITIVE AND NEGATIVE TROPISMS
Positive Tropisms - The plant grows in the direction from which the stimulus works.
Negative Tropisms - The plant grows away or in the other direction from which the stimulus works.
Photo by
ecstaticist
4.
STIMULI AND STIMULUS
Stimuli - Is plural or more than one.
Stimulus - Is singularly or only one.
Photo by
dailyjoe
5.
GRAVATROPISM
A plants movement in response to Gravity.
Postive - Grows towards gravity.
Negative - Grows away from Gravtiy.
Photo by
BlueRidgeKitties
6.
CHEOTROPISM
A plants movement in response to chemicals
Positive - Growing more because of fertilizer.
Negative - Grows less or dies because of weed killer.
Photo by
IRRI Images
7.
PHOTOTROPISM
A plants movement in response to light.
Positive - The plants are moving to face the sun.
Negative - When the roots grow away from the light.
Photo by
r_neches
8.
THENMOTROPISM
A plants movement in response to temperature change
Positive - The temperature helps the plant grow.
Negative - The temperature hurts the plant.
Photo by
tommaync
9.
HYDROTROPISM
A plants movement in response to water.
Positive - Moves towards the water
Negative - Moves away from the water
Photo by
cragproductions.
10.
THISMOTROPISM
A plants movement in response to Touch.
Positive - Vines growing to touch a wall.
Negative - Touch Me Nots: They close up because of touch.
Photo by
vivekrajkanhangad
Zach Schrag
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