Answer: D

Explanation:

Free-floating hydrophytes remain in contact with water and air but do not remain in contact with soil. They float freely on the water surface. In some of these plants the leaves are microscopic while in others they are large. Some free -floating hydrophytes are Wolffia, Lemna, Spirodella, Azolla , Eichhornia, Salvinia and Pistia. Hence, option (d) is correct.

Answer: D

Explanation:

It began in a small hill village in the upper Himalayas. This specific movement was started by uneducated tribal women in December 1972, which became famous by the name of Chipko movement (Chipko means to embrace or wrap). Hence, statement 1 is incorrect.

The women of Advani village of Tehri-Garhwal saved themselves by clinging around the trees and faced police bullets in February 1978 and later had to go to judicial custody . The objective of this movement was to save the trees on the slopes of the Himalayas from being cut by contractors. Hence, statement 2 is incorrect.

This movement continued under the leadership of Shri Sunderlal Bahuguna in various villages of Tehri-Garhwal, like Advani and Budhekar. In the UNEP meeting held in London in June, 1982, Sunderlal Bahuguna presented the plan of Chipko movement for the protection of soil and water by banning the cutting of trees in the Himalayan region. Hence, statement 3 is incorrect.

Answer: C

Explanation:

Biomass energy comes from three sources – residues from agricultural crops, waste materials from municipalities and industries, and energy plantations. This includes fast-growing plants and grasses, agricultural residues, such as vegetable oil, wheat straw, corn, wood, paper, wood chips and methane, etc. Hence, option (c) is correct.

Answer: B

Explanation:

The first meeting of the Asia-Pacific Partnership on Clean Development and Climate was held in Sydney on 11–12 January 2006. All six countries, India, China, Australia, South Korea, Japan and the United States, were included in this, which emit 48% of the world's total greenhouse gas emissions. Hence, option (b) is correct.

Answer: C

Explanation:

After thermal power plants, toxic smoke emitted from motor vehicles is the second largest source of air pollution. Increasing traffic density is continuously posing a threat to ambient air quality. The number of automated vehicles is increasing in metro cities and other urban areas in India. In major metro cities of the country, vehicle exhaust contains 70% of all CO, 50% of all hydrocarbons, 30-40% of all oxides and up to 30% of suspended particulates. Hence, option (c) is correct.