Sensory Reception Flashcards

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0
Q

What is the main advantage of being able to respond to stimuli?

A

It increases an organisms chances of survival

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1
Q

What is a stimulus?

A

A detectable change in the internal or external environment of an organism that produces a response in the organism

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2
Q

What causes organisms with more appropriate responses to be favoured?

A

Selection pressure

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3
Q

What detects stimuli?

A

Cells or organs known as receptors

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4
Q

What do receptors do?

A

They transform the energy of a stimulus into some form of energy that can be processed by the organism and leads to a response

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5
Q

What carries out the response to a stimuli?

A

An effector

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6
Q

What is one way in which receptors and effectors can communicate?

A

Via chemicals such as hormones

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7
Q

How do the receptors and effectors in animals communicate so rapidly?

A

The communicate via the nervous system

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8
Q

What is each effector and receptor linked to?

A

A central coordinator

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9
Q

What is a taxis?

A

A simple response whose direction is determined by the direction of the stimulus

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10
Q

What sort of organisms respond directly to environmental changes by moving its whole body either towards a favourable stimulus or away from an unfavourable one?

A

A motile organism

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11
Q

Taxes are classified in two ways. What are they?

A

Positive and negative taxis

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12
Q

Name 2 types of taxis

A

Phototaxis and chemotaxis

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13
Q

What is a kinesis?

A

A form of response in which the random movements of an organism increases in response to unpleasant stimuli

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14
Q

What is a kinesis response designed to do?

A

To bring the organism back into favourable conditions

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15
Q

What is a tropism?

A

A growth movement of part of a plant in response to a directional stimulus

16
Q

Give 3 examples of tropisms

A

Phototropism, Hydrotropism and Geotropism