U6T2 – Taxes and Kinesis

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Taxis and Kinesis

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What is the definition of a stimulus?

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True or False : Kinesis is a directional response to a stimulus.

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True or False : Taxis is when an organism either moves faster in harsh conditions or turns less in harsh conditions.

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True or false : Kinesis is a random movement

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True or false : Taxis is a directional movement

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Flatworms turn more frequently in response to an increase in light intensity. Is this taxis or kinesis?

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True or False : Taxis is only ever away from a stimulus

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Blow fly maggots have a light sensitive spot on their head, which they use to move away from light. Is this taxis or kinesis?

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Maggots follow a scent up a concentration gradient towards a food source. Is this taxis or kinesis?

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Woodlice are more stationary with increased humidity. Is this taxis or kinesis?

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Honey bees can detect the polarised light from the sun and use it to navigate even in cloudy weather. Is this taxis or kinesis?

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What piece of equipment do animal scientists use to investigate the effect of different stimuli on invertebrates?

13 / 15

In the above experiment on woodlice, what is the Independent variable?

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In the above experiment on woodlice, how would you make the method more valid?

15 / 15

In the above experiment, you hypothesised that a woodlouse responds by kinesis to a change in light intensity. What would be the best way to measure a response which shows kinesis?

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