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A set up that was used to investigate certain process in plants is shown in the diagram below.
![setup16520201007.png](/courses/uploads/setup16520201007.png)
(a) What process was being investigated?
(b) (i) State two precautions that should be taken when setting up the experiment.
(ii) Give a reason for each precaution stated in (b) (i) above.
(c) State three environmental factors that influence the process under investigation.