The following set up was set for the form two class to study a certain concept.
![BioF4et121p2q1](https://www.easyelimu.com/images/form_4_past_papers/Form4_EndTerm1_2021/bio_paper_1_2_3/BioF4et121p2q1.JPG)
- Point out one mistake in the set-up and correct the mistake on diagram.
- State the aim of the experiment.
- Explain how the apparatus is used to achieve the aim of the experiment.