Q. No.Phytoplanktons kill the fish because :
| 1. | Phytoplanktons decrease the BOD level that causes the death of fish. |
| 2. | Phytoplanktons increase the BOD level that causes the death of fish. |
| 3. | Phytoplanktons reduce the amount of dissolved CO2. |
| 4. | None of the above. |
Environmental chemistry is best defined as :
1. Study of chemical processes in nature.
2. Study of biochemical processes in nature.
3. Both (1) and (2)
4. None of the above.
The reaction/s involved during the formation of photochemical smog are:
\(1. \space NO_2(g) \rightarrow NO(g) + \stackrel{\cdot}{O(g)}\)
\(2. \stackrel{\cdot}{O(g)} + O_2(g) \rightarrow O_3(g)\)
\(3.\space O_3(g) + NO(g) \rightarrow NO_2(g) + O_2(g)\)
4. All of the above
The correct statement about domestic waste is :
| 1. | Only biodegradable domestic waste can be used as manure. |
| 2. | Non-biodegradable waste should be sent to industries for recycling. |
| 3. | It can be disposed off in a landfill. |
| 4. | All of the above. |
Tropospheric pollution arises due to the presence of:
| 1. | SO2, SO3, and NO2, in the lowest layer of the atmosphere. |
| 2. | SO2, SO3, and NO2, in the uppermost layer of the atmosphere. |
| 3. | SO2, SO3, and NO2, in the middle layer of the atmosphere. |
| 4. | All of the above. |
The reaction(s) involved in ozone layer depletion in the stratosphere is/are:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. | All of the above |
In the absence of greenhouse gases -
| 1. | Life on earth would be impossible. |
| 2. | Average temperature of the earth will decrease drastically. |
| 3. | There will be no effect on Earth |
| 4. | Both (1) and (2) |
Gases responsible for greenhouse effect are :
1. Carbon dioxide (CO2)
2. Ozone (O3)
3. Nitrous oxide (N2O)
4. All of the above.
Consequence(s) of ozone hole is/are:
| 1. | They cause death of many phytoplanktons. |
| 2. | Excess exposure may even cause mutation in plants. |
| 3. | It leads to the ageing of skin, cataracts, skin cancer, and sunburns. |
| 4. | All of the above. |
The correct statement(s) regarding green chemistry is/are:
| 1. | It helps in decreasing environmental pollution. |
| 2. | It prevents or limits chemical pollutants from being introduced into the environment. |
| 3. | It reduces the use and generation of substances hazardous to the environment. |
| 4. | All of the above. |
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