The famous scientist who proved the presence of micro organisms in air, water and soil

Alexander Fleming discovered

Nylon is an example of

Which immunisation campaign was established  by the Government to eradicate poliomyelitis?

What is a 'Quest for Truth' ?

 Which of the following produces radioactive dust which is harmful to human beings?

 The programme through which Polio is eradicated

Early man became civilized with the help of 

 Early man invented which of the following to make his work easy?

Which type of life, did the early man lead?