Peel off the thin membrane inside a layer of onion. Place it on a glass slide and put a drop of iodine on it. Cover it with a cover slip. Now your slide is ready. Observe it under a microscope. You will see cells which have a nucleus and are enclosed in a cell wall. Draw the onion cells as you see them under the microscope.

Cells in the living organisms are basic structural units. Onion being a plant cell has cell wall which is a difference between animal and plant cell. The cell wall is thick and prevents the cells from temperature, atmospheric moisture.

The cell is filled with semi fluid called cytoplasm. This cytoplasm consists of centrally placed nucleus.

Microscopic view of onion slide -