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Published on Nov 21, 2015

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PRESENTATION OUTLINE

THE TYPES OF TROPISM

BY CHRISSY THOMPSON

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Gravitropism
Geotropism (or gravitropism), movement or growth in response to gravity

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Chemotropism
Chemotropism, movement or growth in response to chemicals

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Phototropism
Phototropism, movement or growth in response to lights or colors of light (e.g.- the sunflower)

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Thermotropism
Thermotropism, movement or growth in response to temperature

Photo by Sam Ilić

Thigmotropism
Thigmotropism, movement or growth in response to touch or contact

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Electrotropism
Electrotropism, movement or growth in response to an electric field

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Heliotropism
Heliotropism, movement or growth in response to sunlight

Photo by Lars Plougmann

Sonotropism
Sonotropism, movement or growth in response to sound.

Photo by Fey Ilyas

The last four... Tropisms!

Exotropism, continuation of growth "outward," i.e. in the previously established direction
Ecotropism, limited host range (e.g. infects only one species or cell type)
Amphotropism, wide host range (e.g. infects many of entry into cells used by a given strain of HIV)
Neurotropism, a virus that preferentially infects the host's nervous system.
Photoperiodism, is response to seasons

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