61.
Common indicator organisms of water pollution is

62.
What percentage of solar energy/radiation is used in photosynthesis?

63.
Environmental studies are very important for

64.
Increased arthmatic attacks in certain seasons are related to

65.
The circulation or cycling of elements in an ecosystem is known as

66.
Complete the following
Organisms ⟶ Populations ⟶ Communities ⟶ . . . . . . . . Ecosphere.

67.
Which one of the following is matching sanctuary?

68.
Major source of biologically significant sulphur is

69.
Animals and plants are best protected in

70.
Product moment coefficient of correlation measures which particular type of relationship between two variables?

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