dB is a standard abbreviation used for the quantitative expression of 

• the density of bacteria in a medium

• a particular pollutant

• the dominant Bacillus in a culture

• the dominant Bacillus in a culture

The two gases making highest relative contribution to the green house gases are

• CO₂ and CH₄

• CH₄ and NO₂

• CFCs and N₂O

• CFCs and N₂O

Which one of the following is not used in organic farming?

• Glomus

• Earthworm

• Oscillatoria

• Oscillatoria

Chipko movement was launched for the protection of 

• grasslands

• forests

• livestock

• livestock

Montreal protocol aims at

• reduction of ozone depleting substances

• biodiversity conservation

• control of water pollution

• control of water pollution

Steps taken by the Government of India to control air pollution include

• compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel

• Compulsory PUC (pollution Under control) certification of petrol driven vehicles, which tests for carbon monoxide and hydrocarbons

• permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles

• permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles

Global agreement on specific control strategies to reduce the release of ozone depleting substance was adopted by

• Rio de Janerio Conference

• The Montreal protocol

• The koyoto protocol

• The koyoto protocol

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this

(1) lost of urea and phosphate fertiliser were used in the crops in the vicinity.

(2) The area was sprayed with DDT by an aircraft.

(3) The lake water turned green and stinky/

(4) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

Which were two of above the main causes of fish mortality in the lake?

• 2, 3

• 3, 4

• 1,3

• 1,3

About 70% of total global carbon is found in 

• grasslands

• agro -ecosystem

• Oceans

• Oceans

Modern detergents contain enzyme preparations of 

• acidophiles 

• alkaliphiles

• thermoacidophiles 

• thermoacidophiles