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Biogeography - GK Questions and Answers for competitive exams on Geography | page-12

Questions
56 Which one of the following derives energy only from Trophic level I ?
A Herbivores
B Carnivores
C Detritivores
D Omnivores

Answer: Option [A]

The correct answer is Herbivores. A food web starts at trophic level 1 with primary producers such as plants, can move to herbivores at level 2, carnivores at level 3 or higher, and typically finish with apex predators at level 4 or 5.

57 The extremely acidic soils have a PH value of
A 4-8
B 4- 4.5
C 4.5- 5
D 5- 5.5

Answer: Option [B]

The extremely acidic soils have a PH value of 4- 4.5. Less than 6.5—acidic, and soils with pH less than 5.5 are considered strongly acidic.

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58 Which one of the following is a greenhouse gas ?
A Methane
B Nitrogen
C Hydrogen
D None of the above

Answer: Option [A]

The correct answer is Methane. Methane is also a powerful greenhouse gas. Over a 20-year period, it is 80 times more potent at warming than carbon dioxide. Methane has accounted for roughly 30 per cent of global warming since pre-industrial times and is proliferating faster than at any other time since record keeping began in the 1980s.

59 Which one of the following is known as closed savanna ?
A Tree savanna
B Grass savanna
C Shrub savanna
D Woodland savanna

Answer: Option [D]

The correct answer is Woodland savanna. Woodlands and savannas are biomes that cover 20% of the world's land surface and are highly concentrated between the equatorial rain forests and the mid-latitude deserts and semi-deserts. Woodlands are typically easy to distinguish from forests; however, the grade between woodland and savanna is often complicated.

60 Which one of the following is the permissible noise level of industrial areas in India during day time ?
A 45dB
B 65dB
C 75 dB
D 90 dB

Answer: Option [C]

The correct answer is 75 dB. In industrial areas, the permissible limit is 75 dB for daytime and 70 dB at night. In commercial areas, it is 65 dB and 55 dB, while in residential areas it is 55 dB and 45 dB during daytime and night respectively.

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