1. (i) What is the purpose of keeping potassium hydroxide solution in test tubes X and Y?   2. (ii) What is the purpose of keeping boiled peas soaked in a disinfectant in test tube Y?   3. (iii) Why has coloured water risen in tubing 1?   4. (iv) Name the biological process which causes the above rise.   5. (v) Define the biological process shown in the experiment.