About 70% of total global carbon is found in 

  • grasslands

  • agro -ecosystem

  • Oceans

  • Oceans


C.

Oceans

The atmosphere is the source of carbon dioxide, which is utilised by plants in photosynthesis reduced to form carbon compounds. The total mass of carbon currently in the atmosphere is about 7 x 1017 g, ie, 700000 million tonnes Oceans regulate the CO2 content in the atmosphere and thus play a very important role. Sea water contains 50 times more CO2 than air, ie, about 70 % of total global carbon is found in oceans. This is in the form of carbonates and bicarbonates.

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World summit on sustainable development (2002) was held in 

  • Brazil

  • Sweden

  • Argentina

  • Argentina


D.

Argentina

In 1992 world leaders convened an Earth Summit in Rio de Janeiro,Brazil, in search of international agreements that could help save the world from pollution, poverty and the waste or resource.Another earth summit was convened from 26 August to 4 September a 2002 in Johannesburg, South Africa. Negotiators for 191 countries agreed on an  action plan to alleviate poverty and conserve the natural resource of earth.

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Which one of the flowing is the correct percentage of the two (out of the total of 4 ) green-house gases that contribute to the total global warming? 

  • CFC 14%, CH4 20%

  • CO2 40% CFCs 30%

  • N2O 6%, CO2 86%

  • N2O 6%, CO2 86%


A.

CFC 14%, CH4 20%

The gases, which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called greenhouse gases. Recently, the concentration of green -house effect that is resulting in increases the mean global temperature. It is called global warming. The various greenhouse gases are CO2 (warming effect 60%) CH4 (20%)<CFC (14%) and nitrous oxide - N2O (6%)

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According to central pollution control Board (CPCB), which particulate size in diameter (n micrometres) of the air pollutants is responsible for greatest harm to human health?

  • 2.5 or less

  • 1.5 or less

  • 1.0 or less 

  • 1.0 or less 


A.

2.5 or less

Particles in the size range 1-10 μm have measurable settling velocities but are readily stirred by air movements whereas particles of size 0.1-1 μm, a submicroscopic size found in Urban air, undergo random Brownian motion reulting from collisions among individual molecules. Of all the different types of particulates in the atmosphere, the presence of trace elements such as cadmium, lead nickel and mercury may constitute the greatest health hazard.

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Modern detergents contain enzyme preparations of 

  • acidophiles 

  • alkaliphiles

  • thermoacidophiles 

  • thermoacidophiles 


B.

alkaliphiles

Detergents represent the largest industrial application of enzymes amounting to 25-30%  of total sales of the enzyme. The enzymes used in detergents must be cost effective, safe to use and be able to perform the task in the presence of anionic and non-ionic detergents, soaps, oxidants etc, at pH between 8-10.5%. The chief enzymes used are proteases, alpha -amylase and sometimes cellulase.

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