Phytotron is a device

What must be followed during a field study?

$A$ student wishes to study the cell structure under a light microscope having $10X$ eyepiece and $45X$ objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?

Which lenses in an electron microscope are used to control and focus an electron beam?

The correct order of sedimentation of sub-cellular structures during differential centrifugation is:

Feulgen positive reactions are shown by