A renewable exhaustible natural resource is:
dB is a standard abbreviation used for the quantitative expression of
The two gases making highest relative contribution to the greenhouse gases are
Stirred tank bioreactors have been designed for
Which one of the following expanded forms of the following acronyms is correct?
World Summit on Sustainable Development (2002) was held in
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Solution
World Summit on sustainable development (2002) was held in Johannesburg, South Africa, 190 countries pledged their commitment to achieve by 2010,a significant in reduction the current rate of biodiversity loss at global,regional and local levels.
Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming?
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Solution
CFC 14%, Methane 20% is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming. A regular assessment of abundance of green house gases and their impact on global environment is being made by IPCC(Inter-Governmental Panel on Climate Change). The various green house gases are CO2( warming effect 60%), CH4 (effect 20%), chlorofluorocarbons or CFC(14%) and nitrous oxide (N2O), 6%). Others of minor significance are water vapours and ozone .
Which one of the following is being tried in India as a biofuel substitute for fossil fuels?
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Solution
Azadirachta is being tried in India as a biofuel substitute for fossil fuels. Biofuels are the fuels of biological origin.
They constitute renewable form of energy.Energy problems can be solved upto a great extent by efficient and proper used of these biofuels.
Which of the following plant species you would select for the production of bioethanol?
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Solution
Jatropha is useful for production of bioethanol. Jatropha is a genus of approximately 175 succulent plants, shrubs and trees(some are deciduous, like Jatropha curcas L.),from the family Euphorbiaceae.The hardy Jatropha is resistant to drought and pests, and produces seeds containing 27-40% oil. Currently the oil from Jatropha curcas seeds is used for making biodiesel fuel in Philippines and in Brazil, where it grows naturally and in plantations in the southeast, and the north/northeast Brazil. Likewise, Jatropha oil is being promoted as an easily grown bio fuel crop in hundreds of projects throughout India and other developing countries.
Biochemical Oxygen Demand (BOD) in a river water
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Solution
Biochemical Oxygen Demand (BOD) in a river water increases when sewage gets mixed with river water.Biochemical oxygen demand or biological oxygen demand (BOD) is a chemical procedure for determining how fast biological organisms use up oxygen in a body of water. It is used in water quality management and assessment, ecology and environmental science. BOD considered as an indication of the quality of a water source.