Materials required

Permanent slide of T.S. of blastula, compound microscope.

The Procedure

Drag and drop the slide onto the stage of the compound microscope.
Click on the eyepiece of the compound microscope to view the sample.
To observe each part, you can mouse over the image, each part will zoom in.
To label the image, click on zoomed part of image.
Drag and drop the correct labels to appropriate places.
Drag the correct part from the list of cells and drop it in the correct place to form a complete image of sample shown.
You can repeat the experiment by clicking on the ‘Reset’ button.
If you have any doubts, you can click on the help button that provides hints.

In transverse section, the blastula appears as a sphere with a cavity, called blastocoel.
The cells in the blastula arrange themselves in two layers: the inner cell mass, and an outer layer called the trophoblast.