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Shin Hui set up the following experiment to find out if plants take in water through their roots. Shin Hui's teacher commented that the above experiment was not a fair test. Suggest what she should do to ensure a fair test.
Both set-ups must have a layer of oil to prevent evaporation.
Sherlyn set up an experiment as shown below. She placed a stalk of celery in each jar. She poured equal amount of coloured water and oil into Jar P and Jar Q. She then placed the two jars near a window. What was the aim of her experiment?
To find out if the size of the celery affects the amount of water it absorbs.
Yan Yi carried out an experiment on a stem of a plant as shown below. She observed that only the leaves at the position Y died after two days. Explain why the leaves at position Y died after 2 days.
The water carrying tubes have been removed. The leaves at Y are unable to receive water to make food.
Mary wanted to find out if the different ways she cut the stalks of Carnation would affect the amount of water taken by them. Her teacher told her that the experiment is not a fair one. Suggest two changes that she should make to set-up B.
Ensure that it has 250 ml of water and the flower has 2 leaves.
Lily set up an experiment as shown below to find out if roots of the plant take in water. However, her teacher said that she did not set up a control. Draw and label all parts of a suitable control set-up.
Check drawings