Environmental Science In Agricultural - Study Mode

[#126] Biosphere extends from ocean bottom to mountain tops to a distance of
Correct Answer

(B) 22.5 km

Explanation

Solution: Biosphere extends from ocean bottom to mountain tops to a distance of 22.5 km. The biosphere is the global ecological system integrating all living beings including their interaction with the elements of lithosphere, cryosphere, hydrosphere and atmosphere. Life forms live in every part of the Earth's biosphere, including soil, hot springs, inside rocks, deep underground, and high in the atmosphere.

[#127] The major pollutant/parts in petrol based vehicles is/are
Correct Answer

(D) All of the above

Explanation

Solution: The major pollutants/parts in petrol-based vehicles are Fuel tank, Crankcase and Carburetor. The crankcase is formed by the portion of the cylinder block below the cylinder bores and the stamped or cast metal oil pan that forms the lower enclosure of the engine and also serves as a lubricating oil reservoir or sump. Carburetor, also spelled carburettor, device for supplying a spark-ignition engine with a mixture of fuel and air. Components of carburetors usually include a storage chamber for liquid fuel, a choke, an idling jet, a main jet, a venturi-shaped air-flow restriction, and an accelerator pump.

[#128] One hectare of good forest picks up, CO 2 and releases O 2 respectively
Correct Answer

(A) 30,000 kg and 10,000 kg

Explanation

Solution: One hectare of good forest picks up nearly 30,000 kg of CO 2 and releases 10,000 kg of O 2 respectively. With a spacing between lines of 3 meters and a spacing of plants within a line of 3 meters, a planting density of 1,111 trees can be planted in a hectare, which utilizes a huge amount of carbon dioxide from the atmosphere and at the same time release good amount of oxygen.

[#129] The important categories of solid waste are
Correct Answer

(D) All of these

Explanation

Solution: The important categories of solid waste are Municipal wastes, Industrial wastes and Hazardous wastes. A solid waste is defined as any discarded material that is abandoned by being disposed of, burned or incinerated, recycled or considered "waste-like. It is the unwanted or useless solid materials generated from human activities in residential, industrial or commercial areas. It may be categorized in three ways. According to its origin as domestic, industrial, commercial, construction or institutional.

[#130] Natural sink of stratospheric ozone is
Correct Answer

(C) Freons

Explanation

Solution: Natural sink of stratospheric ozone is Freons. Freons is a registered trademark of the Chemours Company and generic descriptor for several halocarbon products. They are stable, nonflammable, low-toxicity gases or liquids which have generally been used as refrigerants and as aerosol propellants. Freons are chlorofluorocarbon compounds that containcontain only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane and propane. These include the chlorofluorocarbons that cause ozone depletion and HCFCs.