Q. No.A substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource is called:
1.
Pathogen
2.
Allergen
3.
Pollutant
4.
Secondary metabolite
Identify the incorrect statement regarding primary air pollutants:
| 1. | Carbon monoxide is a product of incomplete combustion of fossil fuels. |
| 2. | Methane is the most abundant hydrocarbon in the atmosphere |
| 3. | A high concentration of sulphur dioxide causes severe respiratory problems |
| 4. | Particulate matter less than 1 micrometer in diameter generally settle out in less than a day. |
Hot wastewater discharged from industries into water bodies:
| 1. | increases the nutrient content of the water body |
| 2. | decreases the BOD of water |
| 3. | is considered a water pollutant |
| 4. | is desirable as cool water is more damaging to aquatic life |
Biomagnification can occur as a result of:
| I: | Persistence |
| II: | Food chain energetics |
| III: | Low or non-existent rate of internal degradation or excretion of the substance |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Arcata Wildlife Sanctuary in Arcata, California is also a/an:
1. innovative sewer management system
2. tiger reserve
3. nuclear waste disposal site
4. ecological hotspot
Agricultural [Agro-Chemical] pollution may lead to:
| I: | Leaching, runoff and eutrophication |
| II: | Contamination of water bodies by heavy metals |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
The number of the correct statements regarding organic farming, amongst the following, are:
| I: | Organic farming encourages crop diversity and often employs polyculture. |
| II: | Organic farming relies heavily on the natural breakdown of organic matter. |
| III: | Organic weed management promotes weed elimination, rather than weed suppression |
| IV: | Pest are used under Integrated Pest Management |
| V: | Raising livestock and poultry, for meat, dairy and eggs, is another traditional farming activity that complements growing. |
| VI: | It promotes use of genetically engineered plants and animals. |
1. Three
2. Four
3. Five
4. Six
It is necessary to remove sulphur from petroleum products to
| 1. | reduce the emission of sulphur dioxide in exhaust fumes |
| 2. | increase efficiency of automobiles' engines |
| 3. | use sulphur removed from petroleum for commercial purposes |
| 4. | increase the life span of engine silencers |
Algal blooms impart a distinct colour to water due to:
| 1. | Their pigments |
| 2. | Excretion of coloured substances |
| 3. | Formation of coloured chemicals in water facilitated by physiological degradation of algae |
| 4. | Absorption of light by algal cell wall |
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