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121.

The true statement about 'green-house effect' is that it is caused by :

122.

Soil carried by gravity is

123.

Which of the following is not a Green-house gas?

124.

Freon gas causing stratospheric O₃ depletion is mainly released from

125.

Which of the following diseases is related to cadmium pollution?

126.

Nutrient enrichment of a lake will cause

The accumulation of toxic substances at the rate greater than at which the same substance is lost by an organism is called bioaccumulation.

Biomagnification is the process by which non- biodegradable chemicals become more concentrated in each link of food chain.

128.

SO₂ pollution is indicated by

129.

Which one of the following is mainly responsible for green houses effect?

130.

For a clean environment, which one following is not essential?