14.1 - Stimuli & Responses Flashcards by Sam McGee

Q

How do organisms detect stimuli?

A

Receptors

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Q

What is a stimulus?

A

Detectable change in environment

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Q

What is a receptor?

A

Detects specific stimuli

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Q

What is a coordinator?

A

Coordinates response to stimulus

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Q

What is an effector?

A

Produces response to stimulus

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Q

What is a response?

A

Action produced by effector

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Q

Why are responses to stimuli crucial?

A

Navigate resources

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Q

What is a taxis?

A

Directional response to stimulus

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Q

What is positive taxis?

A

Movement towards stimulus

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Q

What is negative taxis?

A

Movement away from stimulus

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Q

What is positive phototaxis?

A

Movement towards light

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Q

What is negative phototaxis?

A

Movement away from light

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Q

What is positive chemotaxis?

A

Movement towards chemical

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Q

What is kinesis?

A

Non-directional response adjusting movement speed

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Q

What is the effect of unfavourable conditions on kinesis?

A

Increased turning

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Q

What is the effect of favourable conditions on kinesis?

A

Accelerated movement

Q

What is a tropism?

A

Growth response to directional stimulus

Q

What is phototropism?

A

Growth towards or away from light

Q

What is gravitropism?

A

Growth towards or away from gravity

Q

What tropisms do shoots exhibit?

A

Positive phototropism

Q

What tropisms do roots exhibit?

A

Negative phototropism