Q. No.A lake which is rich in organic waste may result in
(1) increased population of aquatic organisms due to minerals
(2) drying of the lake due to algal bloom
(3) increased population of fish due to lots of nutrients
(4) mortality of fish due to lack of oxygen
Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers
(1) ozone
(2) ammonia
(3) methane
(4) nitrous oxide
Joint Forest Management Concept was introduced in India during
(1) 1970s
(2) 1980s
(3) 1990s
(4) 1960s
A river with an inflow of domestic sewage rich in organic waste may result in
1. increased population of aquatic food web organisms
2. an increased production of fish due to biodegradable nutrients
3. death of fish due to lack of oxygen
4. drying of the river very soon due to algal bloom
1. Carbon
2. Cl
3. Fe
4. Oxygen
Match the items given in Column I with those in Column II and select the correct option given below:
| Column I | Column II | ||
| (a) | Eutrophication | (i) | UV-B radiation |
| (b) | Sanitary landfill | (ii) | Deforestation |
| (c) | Snow blindness | (iii) | Nutrient enrichment |
| (d) | Jhum cultivation | (iv) | Waste disposal |
| Options: | (a) | (b) | (c) | (d) |
| 1. | (ii) | (i) | (iii) | (iv) |
| 2. | (i) | (iii) | (iv) | (ii) |
| 3. | (iii) | (iv) | (i) | (ii) |
| 4. | (i) | (ii) | (iv) | (iii) |
Biochemical Oxygen Demand (BOD) may not be a good index for pollution in water bodies receiving effluents from?
1. domestic sewage
2. dairy industry
3. petroleum industry
4. sugar industry
2. 1980s
3. 1990s
4. 1960s
An increase in the concentration of the toxicant at successive trophic levels is known as:
1. Biomagnifications
2. Biodeterioration
3. Biotransformation
4. Biogeochemical cycling
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