1. | Photochemical smog is harmful to humans but has no effect on plants. |
2. | Plants like Pinus, Juniparus can help in reducing the photochemical smog. |
3. | Photochemical smog occurs in warm, dry, and sunny climates. |
4. | Common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde, and peroxyacetyl nitrate. |
Statement I: | The nutrient deficient water bodies lead to eutrophication. |
Statement II: | Eutrophication leads to decrease in the level of oxygen in the water bodies. |
List-I | List-II |
(a) Biochemical oxygen demand | (i) Oxidising mixture |
(b) Photochemical smog | (ii) Polar stratospheric cloud |
(c) Classical smog | (iii) Organic matter in water |
(d) Ozone layer depletion | (iv) Reducing mixture |
(a) | (b) | (c) | (d) | |
1. | (i) | (iv) | (ii) | (iii) |
2. | (iii) | (iv) | (i) | (ii) |
3. | (iii) | (i) | (iv) | (ii) |
4. | (iv) | (iii) | (ii) | (i) |
A student collected samples from two water bodies A and B in a metro city. The biochemical oxygen demand for 'A' is 3 ppm while for B is found to be 18 ppm. Which one of the following is true?
1. Both A and B are clean
2. Both A and B are polluted
3. A is clean but B is polluted
4. A is polluted but B is clean
Match List-1 with List-II
List-I | List-II |
(a). | (i). Acid rain |
(b). |
(ii). Smog |
(c). |
(iii). Ozone depletion |
(d). | (iv). Tropospheric pollution |
Choose the correct answer from the options given below:
(a). | (b). | (c). | (d). | |
1. | (iv). | (iii). | (i). | (ii). |
2. | (iii). | (ii). | (iv). | (i). |
3. | (i). | (ii). | (iii). | (iv). |
4. | (ii). | (iii). | (iv). | (i). |
The best measure(s) to control water pollution is/are:
1. | Compost should be preferred over chemical fertilizers. |
2. | The concentration of pollutants in the industrial plants should be checked regularly. |
3. | All industrial and chemical discharges should be made free from toxic metals before allowing them to enter a water body. |
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. |
The example(s) of pesticide is/are-
1. Aldrin
2. Sodium chlorate
3. Dieldrin
4. Both (1) and (3)
The major source(s) of soil pollution is/are:
1. Industrial waste.
2. Fertilizers and pesticides.
3. Organic compost.
4. Both (1) are (2)