DDT residues are rapidly passed through food chain causing biomagnification because DDT is:
1. lipo soluble
2. moderately toxic
3. non-toxic to aquatic animals
4. water soluble
Steps taken by the Government of India to control air pollution include:
1. | compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel |
2. | compulsory PUC (Pollution Under Control) certification of petrol driven vehicles, which tests for carbon monoxide and hydrocarbons |
3. | permission to use only pure diesel with a maximum of 500 ppm Sulphur as fuel for vehicles |
4. | use of non-polluting Compressed Natural Gas(CNG) only as fuel by all buses and trucks |
Montreal protocol aims at:
1. reduction of ozone depleting substances
2. biodiversity conservation
3. control of water pollution
4. control of CO2 emission
Biochemical Oxygen Demand (BOD) in river water:
1. | remains unchanged when algal bloom occurs |
2. | has no relationship with the concentration of oxygen in the water |
3. | gives a measure of Salmonella in the water |
4. | increases, when sewage gets mixed with river water |
Global agreement in specific control strategies to reduce the release of ozone-depleting substance was adopted by:
1. Rio de Janeiro Conference
2. The Montreal Protocol
3. The Kyoto Protocol
4. The Vienna Convention
A lake near a village suffered heavy mortality of fish within a few days. Consider the following reasons for this:
1. | Lots of urea and phosphate fertilizer were used in the crops in the vicinity. |
2. | The area was sprayed with DDT by an aircraft. |
3. | The lake water turned green and stinky |
4. | Phytoplankton populations in the lake declined initially, thereby, greatly reducing photosynthesis. |
Which two of the above were the main causes of fish mortality in the lake?
1. 2, 3
2. 3, 4
3. 1, 3
4. 1, 2
1. 2.5 or less
2. 1.5 or less
3. 1.0 or less
4. 5.2 or 2.5
Which one of the following statements is correct?
1. | Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies |
2. | Both Azotobacter and Rhizobium in root nodules of plants |
3. | Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in the soil |
4. | At present it is not possible to grow maize without chemical fertilizers |
1. Jatropha
2. Azadirachta
3. Musa
4. Aegilops
In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?
1. SE < S < PE < DE
2. SE < PE < S <DE
3. PE < S < SE < DE
4. S < DE < PE <SE