Question

explain hypotonic and isotonic and hypertonic Solutions in biology

Answer 1

Hypotonic solutions are the ones which have a lower concentration of solute than the cell. Water diffuses into the cell to balance the solute concentration on either side (outside and inside) equal. Here the cell swells up due to entry of water.

Hypertonic solutions are the ones which have higher solute concentration than the cell. Water moves out of the cell through cell membrane to balance the concentration of the solute on either side. It results in cell shrinking .This may also lead to desiccation of the cell.

Isotonic solutions have the same concentration of the solute as the cell. Water moves in and out of the cell with no net change. 

Answer 2

Hypotonic : The movement of water from inside the cell to outer environment

Isotonic : There is no net movement of water.

Hypertonic : The movement of water from outside to inside the cell