This is the correct option as argon is not a greenhouse gas.

This is the correct option as sewage is not a non-degradable soil pollutant. It decomposes easily.

This is the correct option as petroleum is not a renewable natural resource. It is a non-renewable energy resource.

This is the correct option. Troposphere is the layer of the atmosphere in which important climatic events like lightning, thundering, thunderstorm formation, etc. take place.

This is the correct option. Exosphere is the topmost layer of the atmosphere. This is the outermost region of the Earth's atmosphere, lying above the thermosphere and extending thousands of kilometres into space.

This is the correct option as this is not a characteristic of renewable resources. Renewable resources are biotic in nature. Biotic resources consist of living things. They can continue to reproduce and regenerate their population in favourable environment. Abiotic resources consist of non living things. They do not have the capacity to reproduce and regenerate their population.

This is the correct option as soil water is not a source of surface water.

This is the correct option as this statement is false. In coastal areas, during daytime, there is a regular flow of cool air from the sea towards the land and not from the land towards the sea.

This is the correct option. Nitrogen, though present in the largest quantity in air, does not cause air pollution.

This is the correct option as all of the above are ozone-depleting substances. This is the correct option as all of the above are ozone depleting substances.

This is the correct option as this statement is false. Ozone is present in significant amounts in the stratosphere, and not the troposphere region of the atmosphere.

This is the correct option. A-horizon is the uppermost dark-colored layer of soil consisting mainly of partly disintegrated organic debris. B-horizon is composed of mineral soil (subsoil). C-horizon contains the unconsolidated parent material.

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.

This is the correct option. Capillary water is the water that moves against the pull of gravity when tiny pore spaces in the soil act as capillaries. Hygroscopic water is the water that forms an extremely thin, tightly held film around the soil particles. Combined water is the small portion of soil water that is chemically bound with soil materials.

This is the correct option. Sandy soil is found in desert areas and cannot hold much water. Clayey soil is compact and can hold water, but cannot trap air. Loamy soil has good water holding capacity and is porous to allow aeration of roots. This option is wrong. Sandy soil is found in desert areas and cannot hold much water. Loamy soil has good water holding capacity and is porous to allow aeration of roots.

This is the correct option. The biomagnification of mercury in the fishes through a food chain results in 'Minamata disease' in the fish-eating population of the region.

This is the correct option as sewage, industrial waste, and synthetic soaps and detergents are all sources of water pollution.

This is the correct option as construction sites are not a point source of water pollution. They are a non-point source of water pollution. Unlike point sources, these sources are difficult to monitor and treat, to remove the pollutants.

This is the correct option as this is the positive effect of soil erosion. Fertility gets enhanced when soils are washed down from the hills into river valleys and deltas or are deposited on prairies by wind.

This is the correct option. Phosphorus has sedimentary biogeochemical cycles. Sedimentary biogeochemical cycles are systems in which the reservoir is in the crust of the Earth. .

This is the correct option. Azotobactor is a nitrogen fixing bacteria.

This is the correct option. Fungi plays the role of ammonification, i.e. conversion of nitrogen containing proteins of dead plants and animals into ammonia.

This is the correct option. Moss follows the growth of lichens on barren rocks.

This is the correct option. The conversion of nitrogen containing proteins of dead plants and animals into ammonia is called ammonification.

This is the correct option as oceans form the largest global reservoir of water.

This is the correct option. Alluvial soil is layered and consists of smooth round particles and contains gravel, sand and clay. Desert soil is coarse, sandy and porous, is greyish brown in colour and is rich in minerals. Mountainous soil consists of sand, stones, clay, shales and limestones and also contains a good amount of humus.

This is the correct option. Nitrobacter bacteria plays the role of nitrification in the nitrogen cycle, i.e. conversion of ammonia into nitrites and then into nitrates.

This is the correct option. a. Physical weathering - 3. It involves various climatic factors such as temperature, wind, rain water, ice, snow, glaciers and running water. b. Chemical weathering - 1. It involves a variety of processes such as hydrolysis, hydration, oxidation and reduction. c. Biological weathering - 2. It is done by living organisms such as lichens and bryophytes.  

This is the correct option. Underground water is a component of the hydrosphere.