Three plants A, B and C are placed in beakers containing coloured water. The water in each beaker is covered with a layer of oil. The leaves were removed from plant B, while plant C was exposed to a strong light. [5 MARKS]
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(a) In which plant A, B or C, would the water move up fastest? Give a suitable reason for your answer.
(b) In which plant would water move slowly?
(c) Why is the water covered with oil?
(d) What is being investigated in this experiment?