What is the uppermost zone of atmosphere of earth, where shortwave ultraviolet radiations are absorbed?

In biological systems sulphur is largely bound in ____

Percent of water on the world's surface representing fresh water is ____

Indian wolf has become an important animal because :

The area where two major communities meet and blend together is termed as ____

Which one of the following is an endoenzyme in soil?

Walkley and Black rapid titration method is used for the determination of :

The sources of thermal pollution are :

A hazardous waste is characterised by :

Natural gas is composed primarily of :

Which one of the following chemical species of mercury is highly toxic to living system?

Which of the following can be considered in Environmental Risk Assessment?

An earthquake is rated as 'major' if its magnitude in Richter Scale is in the range of :

What is the proportion of the frequency of occurrence of La Nina compared to El Nino?

An element in soil will be considered as a trace element if its concentration is ____

Which one of the following can be estimated by Flame Photometer?

When an atmosphere has an isothermal profile, it is :

What is the wavelength range of UV-C radiation?

What can be the maximum theoretical efficiency of a silicon solar cell?