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An internal stimuli happens from within an organism.
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.
Force of water molecules against the cell wall that allows plants to stand straight. When water enters the plant vacuoles absorb water.
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
An external stimuli happens from the outside of an organism.
Goetropism, Hydrotropism, Thigmotropism,and Phototropism
Picture of external stimuli
Also called gravitropism, is when an organism responds to gravity as a stimulus.
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.
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
Is when an organism responds to water or moisture as a stimulus.
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
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/
Pic of hydrotropism:http://www.digopaul.com/english-word/hydrotropism.html