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An experiment was set up to study the response of woodlice to light. Ten woodlice were placed in a glass tube. After five minutes one end...

An experiment was set up to study the response of woodlice to light. Ten woodlice were placed in a glass tube. After five minutesone end of the tube was covered with black paper to make it dark. The number of woodlice in light and dark was then recorded every minute for five minutes.The diagram below shows the apparatus used.

The table below shows the results of the experiment.

i) Why were the woodlice left there for five minutes before the pack paper was placed on the tube?
ii) Complete the line graph on the grid below to show the number of woodlice found in the dark at each minute during the
experiment. The results for woodlice in light have already been plotted.

iii) State a conclusion which can be drawn from the results of this experiment.
c) A student repeated this experiment.
i) How could the design be changed to make the results more reliable?
ii) State one environmental factor which would be kept the same to allow a valid comparison with the first experiment.

Answers

a)i) to allow time for random distribution / uniform distribution of the woodlice;
ii)
iii) Woodlice are negative phototatic;
b)i) Put equal number of woodlice in dark and light compartments which are interconnected.
iii) temperature

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sharon kalunda answered the question on May 29, 2019 at 09:33

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