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| 211. |
5th June is celebrated as: |
| A. |
World forest day |
B. |
World environment day |
| C. |
World red cross day |
D. |
World food day |
Answer: Option B
Explanation:
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| 212. |
Effect of pollution is first marked on: |
| A. |
Micro-organisms |
B. |
Green vegetation of an area |
| C. |
Food crop |
D. |
None of these |
Answer: Option A
Explanation:
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| 213. |
Loss of forests, urbanization, increasing pollution are all due to: |
| A. |
Population explosion |
B. |
Nitrogen di-oxide |
| C. |
Global warming |
D. |
Sulphur dioxide |
Answer: Option A
Explanation:
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| 214. |
Biological Oxygen Demand (BOD) is a measure of: |
| A. |
Industrial wastes poured into water bodies |
B. |
Extent to which water is polluted with organic compounds |
| C. |
Amount of carbon monoxide inseparably combined with haemoglobin |
D. |
Amount of oxygen needed by green plants during night |
Answer: Option D
Explanation:
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| 215. |
Escherichia coli is used as an indicator organism to determine pollution of water with: |
| A. |
Heavy metals |
B. |
Faecal matter |
| C. |
Industrial effluents |
D. |
Pollen of aquatic plants |
Answer: Option B
Explanation:
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| 216. |
Besides dung, the weed that can be used in biogas production is: |
| A. |
Eichhornia crassipes |
B. |
Solanum nigrum |
| C. |
Hydrilla |
D. |
Parthenium hysterophorus |
| E. |
All of these |
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Answer: Option A
Explanation:
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