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What is the best solution for the treatment of electronic wastes?

 

Recycling is an environmentally friendly manner is the best solution for the treatment of electronic wastes. They can recycle 95-98% by weight.

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What is reforestation?

Restoring a previously existing forest is called reforestation. The intervention of human beings can help in the process.

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What are the three major kinds of impurities in domestic wastewater?

 

Following are the three major kinds of impurities in domestic wastewater.

(a) Suspended impurities like sand and silt.

(b) Colloidal materials like bacteria, faeces, cloth etc.

(c) Dissolved materials like nutrients (nitrates, phosphates, sodium, calcium)

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What do you understand by biomagnification?
 

When a particular substance is passed on through various trophic levels; its concentration of the toxic substances increases at every step. This phenomenon is called biomagnification.

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What is an algal bloom?

 

Excessive growth of free-floating algae on water bodies due to their nutrient enrichment is called an algae bloom.

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Name an industry which can cause both air and thermal pollution and as well as eutrophication.

Fertilizer industry can cause both air and thermal pollution as well as eutrophication.

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Mention any two examples of plants used as windbreakers in the agricultural fields.

Hedge, Jamun, Imli, Neem, Babul, Eucalyptus are some of the plants that can be used as windbreakers in the agricultural fields.

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Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason?

Addition of polyblend to bitumen while laying the roads enhances water repellant property of bitumen. Thus, it increases road life by a factor of three.

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What is the raw material for polyblend?

Polyblends are the natural man-made fibres which are made by a mixture of 2 or more polymers. The raw material for polyblend is polythene.

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List any two adverse effects of particulate matter on human health.

Following are the two adverse effects of particular matter on human health:

(a) Asthma

(b) Respiratory tract infection

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