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

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

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