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
Compressed Natural Gas (CNG) is:
1. | Propane | 2. | Methane |
3. | Ethane | 4. | Butane |
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 |