Sensory Reception

Created by: J.E.C.
Created on: 07-05-14 10:14

What is a stimulus?

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

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The ability to respond to stimuli increases chances of __ and the organism will have a greater chance of...? This means there is always a __ __ favouring organisms with more appropriate __?

Survival, producing offspring and passing on their alleles to the next generation. Selection pressure, responses.

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What is the role of a receptor?

Transform energy of a stimulus into some form of energy that can be processed by the organisms, leading to a response.

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What is the role of an effector?

The cells, tissues, organs or system that carries out the reponse.

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One form of communication between receptors and effectors found in animals and plants is...? A disadvantage of this is that it is...?

Hormones. Slow

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Give the seuqence of events from stimulus to response?

Stimulus > Receptor > Coordinator > Effector > Response

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What is a taxis? This means a motile organism will respond directly to the environmental change by...?

A simple response whose direction is determined by the direction of the stimulus. Moving its whole body towards a favourable stimulus or away from a unfavourable one.

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What is a kinesis? This types of response is designed to...?

A form of response in which the organism does not move towards or away from a stimulus, but the more unpleasant the stimulus the more rapidly it moves and changes direction. Bring the organism back into favourable conditions.

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What is a tropism?

Growth movement of part of a plant in response to a directional stimulus.

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Give an example of a negative phototropism?

Plant roots grow away from the light and in the direction of gravity as this increases the chance of roots being able to grow into the soil and absorb water and mineral ions.

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Other cards in this set

Card 2

Front

The ability to respond to stimuli increases chances of __ and the organism will have a greater chance of...? This means there is always a __ __ favouring organisms with more appropriate __?

Back

Survival, producing offspring and passing on their alleles to the next generation. Selection pressure, responses.

Card 3

Front

What is the role of a receptor?

Back

Card 4

Front

What is the role of an effector?

Back

Card 5

Front

One form of communication between receptors and effectors found in animals and plants is...? A disadvantage of this is that it is...?

Back

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Sensory Reception