41. Which book written by Rachel Carson resulted in banning DDT in USA?
a.
b.
c.
d.

Option”A” is correct

Mocked for Being a ‘Woman Studying Genetics,’ How Rachel Carson Got DDT Banned. Considered one of Carson’s most exceptional and groundbreaking books that marked a new public awareness about the use of chemical pesticides, especially DDT, Silent Spring was published on September 27, 1962.
42. Any unfavorable alteration of the environment may be called as-
a.
b.
c.
d.

Option”B” is correct

Environmental pollution is the unfavorable alteration of our surroundings, wholly or largely as a byproduct of man’s actions, through direct or indirect effects of the changes in the energy pattern, radiation levels, and chemical and physical constitution and abundance of organisms.
43. Energy resources derived from natural organic materials are called-
a.
b.
c. biomass
d.

Option”B” is correct

Energy resources derived from natural organic materials are called fossil fuels.
44.
Total amount of living material at the various trophic levels of a food chain is depicted by pyramids of-
a. numbers
b. energy
c. biomass
d.

Option”C” is correct

Pyramid of biomass is the graphical representation of total amount of living material at each trophic level of a food chain. Pyramid of numbers represent the number of individuals in each trophic level of a food chain. Pyramid of energy represents the amount of energy at each trophic level of a food chain.
45. Which group of vertebrates comprises the highest number of endangered species?
a. Mammals
b. Fishes
c. Birds
d. Birds

Option”A” is correct

Mammals have 177 endangered species among vertebrates which represents 3.8% of all the species.
46.
Two objects, A and B, have the same mass but the specific heat of A is larger than B. If both objects absorb equal amounts of energy,
a.
b.
c.
d.

Option”B” is correct

B will become warmer than A.
47. In the stratosphere, the air temperature normally:
a.
b.
c.
d.

Option”B” is correct

Within the stratosphere temperatures increase with altitude (see temperature inversion); the top of the stratosphere has a temperature of about 270 K (−3°C or 26.6°F).
48. Disease aggravated by air pollution is-
a.
b.
c. bronchitis
d. haemophilia

Option”C” is correct

Disease aggravated by air pollution is bronchitis.
49. The outermost zone of a biosphere reserve is-
a.
b.
c.
d.

Option”A” is correct

The outermost zone of a biosphere reserve is manipulation zone. The transition area is the outermost part of a biosphere reserve. This is usually not delimited one and is a zone of cooperation where conservation knowledge and management skills are applied and uses are managed in harmony with the purpose of the biosphere reserve.
50. The aurora is produced by:
a.
b.
c.
d.

Option”B” is correct

An aurora is caused by the streams of electrified particles (which are emitted by the sun) trapped in the magnetic field of the earth. It is produced when this magnetosphere is disturbed by the solar wind carrying the charged particles. Auroras are seen in latitudes of around 70 degrees.
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