Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
1). BF3
2). O2
3). CHClF2
4). Cl2
1. Who among the following is commonly called "Bird Man of India"?
2. How much time does the earth take to complete one rotation
3. High biological oxygen demand indicates:
4. In ecological succession from pioneer to climax community, the biomass shall
5. The controversial dam across the river Narmada?
6. Species that occur in different geographical regions separated by special barrier are:
8. The unit of total water content of the soil is known as