CBSE Class 10 Science 2020 · Paper 31/4/1 · Question 4

Our Environment 4 marks Medium

Answer question numbers 4(a) – 4(d) on the basis of your understanding of the following paragraph and the related studied concepts : India today is facing the problem of overuse of resources, contamination of water and soil and lack of methods of processing the waste. The time has come for the world to say goodbye to “single-use plastics”. Steps must be undertaken to develop environment-friendly substitutes, effective plastic waste collection and methods of its disposal. Indore treated 15 lakh metric tonnes of waste in just 3 years, through biomining and bioremediation techniques. Bioremediation involves introducing microbes into a landfill to naturally ‘break’ it down and biomining involves using trommel machines to sift through the waste to separate the ‘soil’ and the waste component. The city managed to chip away 15 lakh metric tonnes of waste at a cost of around ₹ 10 crore. A similar experiment was successfully carried out in Ahmedabad also.

(a)State two methods of effective plastic waste collection in your school.[1]
(b)Name any two uses of “single-use plastic” in daily life.[1]
(c)If we discontinue the use of plastic, how can an environment-friendly substitute be provided ?[1]
(d)Do you think microbes will work similarly in landfill sites as they work in the laboratory ? Justify your answer.[1]

Answer

Separate bins collect plastic; bottles and wrappers are single-use; cloth or jute bags replace plastic; microbes act as in the laboratory.

(a) Keep separate bins for plastic and for paper, and separate biodegradable from non-biodegradable waste at the source. Other correct methods, such as a plastic-collection drive, also earn credit. (b) Packaging of water, milk, food and biscuits (bottles, pouches, wrappers and carry bags), and disposable utility items such as bowls, tumblers, plates and straws. (c) By providing cloth or jute bags, paper bags and packaging, earthen pots and cups, and reusable utensils or leaf plates in place of plastic articles, or any other material that serves the same purpose. (d) Yes. The action of the microbes is tested in the laboratory under the same conditions as in the landfill, so they break down the waste in the landfill in the same way, as the work at Indore and Ahmedabad shows.

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CBSE Class 10 Science 2020 · Paper 31/4/1 · Question 4

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