In any scientific experiment, there are usually two groups under study that are similar to each other except that one receives a treatment or is being manipulated while the other is not. We have the treatment groups and the control groups.
The treatment group is the group that receives a treatment or condition that is being manipulated, while the control group is the group that does not receive the treatment or condition being manipulated. The control group serves as a baseline that enable you to ascertain the effect a treatment being tested has.
Osmosis passes from a medium with a high concentration of water molecules to another with a low concentration of water molecules and since the potato has low water concentration so the water transfers to it increasing its mass
