Large mega projects neglect local irrigation methods. These large scale projects (dams and canals) were developed by the British and are still carried on by our government.

This is the correct option. All are correctly matched. a. Deforestation 2. It is the clearing of forests by cutting down of trees over a wide area. b. Desertification 3. It is the process by which fertile land becomes a desert. c. Reforestation 1. It is the planting of trees in an area in which forests were destroyed.

This is the correct option as all of the above methods have been suggested by environmental biologists for avoiding misuse and wastage of potable water. All are correct options.

Loss of biodiversity will lead to loss of ecological stability.

This is the correct option. Wildlife is a renewable natural resource. Renewable resources are exhaustible resources which get replenished regularly. They can last forever if they are used responsibly.

This is the correct option as atmosphere forms the smallest global reservoir of water.

The planted trees in reforestation should generally be of the same species that were found in that forest and at least equal to the number of trees that are cut. Reforestation can take place naturally also.

Restoration of destroyed forests by planting new trees is known as afforestation.

Amrita Bishnoi lost her life while saving a forest having khejri trees. 

Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids.

Petroleum, coal and natural gas are non-renewable resources.

Coal and petroleum are huge reservoirs of carbon. 

Forests are considered as green lungs in nature because they provide oxygen to aerobic animals and also purify the air by adding oxygen and absorbing carbon dioxide from it.

With an increase in population, the demand for all the natural resources increases exponentially. The demands will not decrease.  

Biofertilisers provide an eco-friendly method to promote plant growth. The rest of the options cause damage to the environment and biodiversity.