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496707
Responses
Descrição
A-level BIOL5 Mapa Mental sobre Responses, criado por prettypriyaz em 21-01-2014.
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biol5
biol5
a-level
Mapa Mental por
prettypriyaz
, atualizado more than 1 year ago
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Criado por
prettypriyaz
mais de 10 anos atrás
51
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Resumo de Recurso
Responses
Animal
Taxis is a directional response to stimulus.
Positive
Movement is towards the stimulus.
Negative
Movement is away from the stimulus.
Examples
Phototaxis (Light)
Maggots use negative phototaxis to move away from light to avoid exposure and dryness.
Single celled algae use positive phototaxis to move towards light to photosynthesis.
Chemotaxis (chemicals)
Male moths use positive chemotaxis when flying towards a pheromone
Kinesis is a response to a changing stimulus by changing the amount of activity.
Orthokinesis
the speed of movement varies with the intensity of the stimulus.
Klinokinesis
the rate of turning depends on the intensity of the stimulus.
Results in random movements.
It is designed to bring the organism back into favourable conditions.
Example
In dry environments woodlice move quickly and don't turn much which increases their chance moving out of the area.
If by chance, they find themselves in a humid environment , they slow down and increase the rate of turning. This tend to keep them in a humid area.
Plants
Tropism is a directional growth responses to stimulus.
Positive
Growing towards the stimulus
Negative
Growing away from the stimulus
Example
Phototaxis (Light)
Plants shoot grow towards the light so their leaves are in the favourable position to absorb sunlight.
Plants root grow away from the light and towards gravity to absorb more minerals ions.
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