TOPIC 6: Organisms Respond to Changes in their Environments

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5 Terms

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Taxis

A directional movement of an organism in response to a stimulus.

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Kinesis

A non-directional movement of an organism in response to a stimulus.

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Tropism (Positive & Negative)

Growth response of a plant to a directional stimulus.

Positive is towards a stimulus and Negative is away from a stimulus.

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Auxins

Plant hormones promoting growth.

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Indoleatic Acid (IAA)

An auxin, produced in the tips of shoots in flowering plants.