Sewage purification is performed by:
1. Microbes
2. Fertilisers
3. Antibiotics
4. Antiseptics
Concentration of DDT is highest in:
1. Primary consumer
2. Producers
3. Top consumer
4. Decomposers
Large-scale death of fish occurs in:
1. Saline lake
2. Oligotrophic lake
3. Eutrophic lake
4. Shallow lake
Maximum DDT is present in birds feeding on:
1. Fishes
2. Meat
3. Insects
4. Seeds
Green house effect is:
1. Gardening outside the house
2. Global cooling
3. Global warming
4. Green colour house
Temperature variation in Pacific ocean in present time is called:
1. Cyclone effect
2. El Nino effect
3. Greenhouse effect
4. Gaudikov's effect
Besides CH4 and CO2, another green house gas is:
1. SO2
2. NH3
3. N2O
4. CFC
If is absent in the atmosphere of the earth, then:
1. Temperature will decrease
2. Temperature will increase
3. Plants will flourish well
4. No effect
Dobson units are used to measure thickness of:
1. Ozone
2. Troposphere
3. CFCs
4. Stratosphere
Consider the following statements (A-D) about organic farming:
A. | Utilizes genetically modified crops like Bt cotton |
B. | Uses only naturally produced inputs like compost |
C. | Does not use pesticides and urea |
D. | Produces vegetables rich in vitamins and minerals |
Which of the above statements is correct?
1. (A) and (B) only
2. (B), (C) and (D)
3. (C) and (D) only
4. (B) and (C) only