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Created by: Russell Reid

Internal

& External Stimuli

Internal Stimuli

An internal stimuli happens from within an organism.

Internal Stimuli

Responses/Examples of Internal Stimuli

Tugor pressure, fever, and vomiting are a few examples of internal stimuli.

Responses/Examples of Internal Stimuli

Picture of a Response to Pathogen.

Turgor Pressure

Force of water molecules against the cell wall that allows plants to stand straight. When water enters the plant vacuoles absorb water.

Turgor Pressure

With and Without Turgor Pressure

With and Without Turgor Pressure

Plants without turgor pressure will start to wilt which is called flaccid. Plant with turgor pressure will stand up and will not wilt which is called turgid.

Picture of Turgor Pressure

Picture of Turgor Pressure

External Stimuli

An external stimuli happens from the outside of an organism.

Responses/Examples of External Stimuli

Goetropism, Hydrotropism, Thigmotropism,and Phototropism

Responses/Examples of External Stimuli

Picture of external stimuli

Geotropism

Also called gravitropism, is when an organism responds to gravity as a stimulus.

Geotropism

Responses/Examples of Geotropism

When a plants roots goes deeper into the ground, this represents positive geotropism. When a plants stem grows straight up it represents negative geotropisnm.

Responses/Examples of Geotropism

Picture of Geotropism

Phototropism

Also called heliotropism, is when an organism responds to light/radiant energy.

Phototropism

Responses/Examples of Phototropism

When a plant turns towards the sun or follows the Sun's movement, this represents positive geotropism. When a plants roots grow away fron the Sun it represents negative phototropism.

Responses/Examples of phototropism

Picture of Phototropism

Picture of Phototropism

Thigmotropism

Is when an organism responds to touch as a stimulus.

Thigmotropism

Responses/Examples of Thigotropism.

When an ivy clings to a tree the roots grow up the tree, this represenst thigmotropism.

Responses/Examples of Thigotropism

Picture of Thigmotropism

Picture of Thimotropism

Hydrotropism

Is when an organism responds to water or moisture as a stimulus.

Hydrotropism

Responses/Examples to Hydrotropism

When roots of a plant move towards water it represents positive hydrotropism. When the stem of the plant grows upward it represents negative hydrotropism.

Responses/Examples to Hydrotropism

Picture of Hydrotropism

Documented Sources

Pic of vomiting: http://www.differencebetween.info/difference-between-nausea-and-vomiting

Pic of turgor pressure: http://www.qsstudy.com/biology/define-turgor-pressure

Pic of external tropism: http://catholicscienceteacher5.blogspot.com/2013/12/plants-tropisms-hormones.html

Pic of geotropism:https: https://www.quora.com/How-exactly-does-geotropism-occur-in-plants

Pic of phototropism:https://en.wikipedia.org/wiki/Phototropism

Pic of thigmotropism:http://www.timberpress.com/blog/2015/06/how-plants-work-4-fun-facts/

More Documented Sources

Pic of hydrotropism:http://www.digopaul.com/english-word/hydrotropism.html

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