- 1(current)
Q. No.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. |
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Ozone is a very toxic gas and a strong oxidizing agent. It is still useful for life on earth :
1. because it traps harmful UV-rays.
2. because it balances global warming.
3. because it traps harmful X-rays.
4. because it traps harmful -rays.
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The reaction(s) involved in ozone layer depletion in the stratosphere is/are:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. | All of the above |
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Ozone depletion occurs in :
1. Tropospheric pollution.
2. Stratospheric pollution.
3. Air pollution.
4. Photochemical smog.
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Incorrect statement among the following is:
1. Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant.
2. pH of drinking water should be between 6.5 and 8.5.
3. Concentration of dissolved oxygen below 6 ppm is good for the growth of fish.
4. Clean water would have a BOD value of less than 5 ppm.
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- 1(current)
Q. No.
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