Q.1:- Which percentage of the world’s population is still dependent upon ‘home-made’ remedies produced from herbs and plants ?
Ans:- 75%
Q.2:- The ………… of a species describes the Trophic function it fills in its environment.
Ans:- Niche
Q.3:- A population that is growing exponentially in the absence of limiting factors can be illustrated by a/an …………..?
(a) S-shaped curve (b) J-shaped curve (c) curve that terminates in a plateau phase (d) tolerance curve
Ans:- (b) J-shaped curve
Q.4:- The natural disaster in which carbon dioxide suddenly erupts from a deep lake water is known as ?
Ans:- Liminic
Q.5:- The massive hole in the Ozone Layer over the Antarctica was first discovered in ?
Ans:- 1985
Q.6:- Why would you prefer to ride a bicycle to school rather than your friend’s scooter ?
(a) You get exercise on a bicycle (b) You will not pollute (c) It is cheaper (d) All of the above
Ans:- (d) All of the above
Q.7:- Heavy metal pollution of water is caused by ?
Ans:- Domestic sewage
Q.8:- In a food chain, the solar energy utilized by plants is only ?
Ans:- 10 percent
Q.9:- The Geysers, a large steam reservoir north of San Francisco, USA, is the world’s largest source of ?
Ans:- Geothermal Power
Q.10:- This strain of rice was one of the first High Yielding Varieties of seeds developed in the world. Name it ?
Ans:- IR-8
Q.11:- Which element is depleted most from the soil after a crop is harvested ?
Ans:- Potassium
Q.12:- Name a commercially used, genetically modified cotton plant resistant to the deadly cotton pest ‘heliothis’ ?
Ans:- Bt. Cotton
Q.13:- Ground water in the Bengal basin is mostly contaminated by ?
Ans:- Arsenic
Q.14:- Municipal waste is disposed in the open dumps, landfills, sanitary landfills, and is also burnt in large furnaces. This method is known as ?
Ans:- Blast Furnace
Q.15:- Supersonic jet causes pollution by thinning of ?
Ans:- O3 Layer
Q.16:- India generates about 4.3 million tons of hazardous wastes every year. Direct exposure to two chemicals in hazardous waste can cause death. What are they?
Ans:- Mercury and Cyanide
Q.17:- Name the gas released from landfills, decaying organic matter under shallow water in marshes and bogs, flooded paddy fields, by ruminant animals & termites, and by the burning of biomass. A molecule of this gas has 21 times more global warming potential than a molecule of CO2.
Ans:- Methane
Q.18:- Cadmium pollution is associated with ?
Ans:- Itai-Itai
Q.19:- Eco-Mark is given to an Indian product which is ?
Ans:- Environment Friendly
Q.20:- The Sun is a ?
(a) Producer of water (b) Secondary source of energy (c) Primary producer of energy (d) Tertiary producer of energy
Ans:- (c) Primary producer of energy
Q.21:- Polar bears are carnivores and prey on many arctic birds and fish. However, under natural conditions, no one found polar bears predating any penguin. This is because ?
Ans:- Polar bears and penguins never coexist under natural conditions. The former lives in the North Pole while the latter lives in the South Pole.
Q.22:- The biome concept illustrates ?
Ans:- dominant plant communities
Q.23:- Acceptable ‘Noise Pollution Level’ in India range between ?
Ans:- 40-45 dec
Q.24:- Which of the following gases is not known as the green house gas ?
(a) Methane (b) Carbon Dioxide (c) Nitrous Oxide (d) Hydrogen
Ans:- (d) Hydrogen
Q.25:- The depletion of Ozone layer is mainly due to ?
Ans:- Chlorofluorocarbons (CFCs)
