Q. No.Biochemical Oxygen Demand (BOD) may not be a good index for pollution in water bodies receiving effluents from?
1. domestic sewage
2. dairy industry
3. petroleum industry
4. sugar industry
A lake which is rich in organic waste may result in?
| 1. | increased population of aquatic organisms due to minerals |
| 2. | drying of the lake due to algal bloom |
| 3. | increased population of fish due to lots of nutrients |
| 4. | mortality of fish due to lack of oxygen |
The highest DDT concentration in aquatic food chain shall occur in?
1. phytoplankton
2. seagull
3. crab
4. eel
2. ammonia
3. methane
4. nitrous oxide
2. 1980s
3. 1990s
4. 1960s
| 1. | increased population of aquatic food web organisms |
| 2. | an increased production of fish due to biodegradable nutrients |
| 3. | death of fish due to lack of oxygen |
| 4. | drying of the river very soon due to algal bloom |
An increase in the concentration of the toxicant at successive trophic levels is known as:
1. Biomagnifications
2. Biodeterioration
3. Biotransformation
4. Biogeochemical cycling
Eutrophication of water bodies leading to the killing of fishes is mainly due to non-availability of:
1. Food
2. Light
3. Essential minerals
4. Oxygen
The zone of atmosphere in which the ozone layer is present is called:
1. Ionosphere
2. Mesosphere
3. Stratosphere
4. Troposphere
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