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ICSE Class 10 Biology Question 4 of 10

Pollution — A Rising Environmental Problem — Question 1

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Question

Question 1

List two major harmful effects of each of the following:

(i) Rivers contaminated with sewage.

(ii) Too much gaseous exhausts containing CO2 and SO2

(iii) Pesticides such as DDT used in agriculture.

(iv) Prolonged noise such as the one produced by crackers

Answer

(i) Two major harmful effects of rivers contaminated with sewage are:

  1. Sewage disposed of into rivers cause diseases such as diarrhoea, dysentery, cholera, typhoid, and jaundice.
  2. The flora and fauna of rivers, sea and oceans is adversely affected.

(ii) Two major harmful effects of too much gaseous exhausts containing CO2 and SO2 are:

  1. Excess emissions of CO2 and SO2 will increase the temperature of earth i.e global warming would increase.
  2. SO2 emissions would lead to severe lung and respiratory diseases.

(iii) Two major harmful effects of pesticides such as DDT used in agriculture are:

  1. Pesticides kill soil microbes which are responsible to recycle the nutrients in the soil.
  2. Pesticides can cause short-term adverse health effects, and can enter the food chain and affect the health of humans as well as animals.

(iv) Two major harmful effects of prolonged noise such as the one produced by crackers are:

  1. Prolonged exposure to the high decibel noise damages eardrums and can bring permanent hearing impairment.
  2. Interrupts concentration of thought and disturbs peace of mind.