51.
Nucleic acids have important genetic materials, these are

52.
Minamata disease is due to pollution of

53.
Breeding place of Flamingo (Hansawar) in India is

54.
Overgrazing causes

55.
The soil near the surface is usually darker than about one meter down, it is because the top soil

56.
Who formulated the twelve principles of "Green Chemistry"?

57.
The pH of a fertile soil is usually around

58.
Biosphere like a balanced aquarium is

59.
The sphere of living matter found on the surface or earth comprises

60.
The words trash, garbage, rubbish, refuse etc. are synonyms with

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