Q. No.Why is carbon dioxide regarded as a greenhouse gas?
1.
It is involved in photosynthesis
2.
It absorbs infrared radiation
3.
It emits visible radiation
4.
It absorbs and emits ultraviolet radiation
The levels of carbon dioxide is consistently increasing over the last 100+ years mainly because:
| 1. | increased respiration by increasing the human population. |
| 2. | increased worldwide standing crop. |
| 3. | an increase in the amount of infrared radiation absorbed by the atmosphere. |
| 4. | the burning of larger amounts of wood and fossil fuels. |
The thawing of permafrost in many areas of the tundra biome as a result of global warming is of concern mainly because:
| 1. | it will decrease the abundance and diversity of soil-dwelling organisms in tundra habitats. |
| 2. | the bacterial decomposition of the thawed organic materials will produce large quantities of CO2, increasing global warming. |
| 3. | Oil and coal deposits will rise to the surface |
| 4. | migration of the human population will occur towards the tropics. |
The highest concentration of polycarbonated biphenyls [PCBs] in a lake is expected in:
| 1. | Small fish | 2. | Sediment |
| 3. | Phytoplankton | 4. | Zooplankton |
The addition of fertilizers is frequently required in agricultural lands but not in wild mainly because:
| 1. | nitrogen-fixing bacteria and detrivores are less potent in agricultural lands. |
| 2. | the nutrients that enter the plants are not returned to the soil on lands where they are harvested. |
| 3. | the agricultural lands are selected for their oligotrophic soils. |
| 4. | cultivation of agricultural lands inhibits the decomposition of organic matter. |
What is most likely to occur due to continued global warming?
| 1. | Poleward movement of plant communities |
| 2. | A fall in the sea levels |
| 3. | Increased decomposition of organic matter in the polar region |
| 4. | Increase in tundra regions |
The environmental pollutants that will have the most negative effects would be:
1. human organic wastes
2. wastes from feedlots
3. an excess of natural nutrients
4. non-biodegradable chemicals
Kyoto protocol commits signatories to:
1. Plant more trees
2. Cut forests for agriculture
3. Increasing nitrogen oxides into the atmosphere
4. Increasing the amount of methane in the atmosphere
“Greenpeace” is a non-governmental environmental organization with headquarters in:
1. Geneva, Switzerland
2. Paris, France
3. Amsterdam, Netherlands
4. Nuuk, Greenland
Identify the incorrectly matched pair:
|
1. |
Ozone depletion |
DNA damage |
|
2. |
Greenhouse effect |
Increased atmospheric carbon dioxide |
|
3. |
Acid rain |
pH < 5 |
|
4. |
Eutrophication |
Decreased primary productivity |
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