Cadmium pollution is associated with ____?                              

Is there concentration in the eye? 

The term ‘ecosystem’ was proposed by—

An element that does not occur in nature but can be produced artificially is 

The pitch of the voice of the women is generally

What enzyme occurs in human tears , causing bacteria to die ? 

This organelle of the human body is known as the ‘powerhouse of the cell’. Name it from the given options.

The major component used in preparation of different types of glasses is :