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Why any source of energy has less consequence? Explain your answer with suitable example.
Any source of energy whether renewable or non-renewable source of energy contributes to environmental pollution directly or indirectly.
Let us take the example of hydro energy. Hydro energy does not emit any air pollutant but it harms environment in the following ways:
The negative impacts of hydro power plant on ecosystem are as follows:
1. Since dams always have a reservoir where abundant quantity of water is stored, the blocking of flowing water causes harm to aquatic animals and their migration.
2. Dams also cause submerging of the nearby lands and all the natural areas, agricultural lands and hence requires relocating of the people who lived previously near the dam area.
In case of wind energy the windmill blades are injurious to the birds.
A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.
A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.
(i) Name the form of energy.
(ii) Is this energy ultimately derived from the sun or not?
(iii) Explain, how this form of energy can be converted into electricity?
Nikhil and Neha went to a remote village in Kerala to meet their grandmother. They were surprised to see bio-gas plant in Mr. Nair’s house in the neighborhood. There was plenty of livestock and the house hold use cooking gas from the plant. Also, their farm had rich vegetation. They contacted sarpanch of the village and convinced him to set up a bio-gas plant for village community.
(i) Mention the values displayed by Mr. Nair. Nikhil and Neha.
(ii) Explain the possible arguments given by Nikhil and Neha to the sarpanch to convince him to set up a bio-gas plant.
Hemant visited his neighboring village, where a bio-gas plant has been installed recently. He was surprised to see the working of the bio-gas plant. He told his village elders about the advantages of setting up a bio-gas plant in their village. Now. Answer the following question:
(i) What are the advantages of a biogas plant?
(ii) Why is a bio-gas plant commonly called as gobar gas plant?
(iii) Why were the villagers are very much impressed with Hemant?