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Need clarity, kindly explain! Match the items given in Column I with those in Column II and select the correct option given below : Column I Column II a. Eutrophication i. UV - B radiation b. Sanitary land

Match the items given in Column I with those in Column II and select the correct option given below : 

 

Column I   Column II
a. Eutrophication i. UV - B radiation

b.

Sanitary landfill ii. Deforestation
c. Snow blindness iii. Nutrient enrichment
d. Jhum cultivation iv. Waste disposal

 

  • Option 1)
    a b c d
    iii iv i ii

     

  • Option 2)
    a b c d
    i iii iv ii
  • Option 3)
    a b c d
    ii i iii iv
  • Option 4)
    a b c d
    i ii iv iii
 
Answers (2)
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N neha

As we learnt in  

Causes of water pollution -

Eutrophication

- wherein

Rich growth of micro-organisms consumes most of the dissolved oxygen, so as to deprive other organisms. It generally occurs at the bottom layers of deep lakes. Addition of excessive plant nutrients intensifies eutrophication. It is harmful to fish and other aquatic life.

 

Jhum cultivation -

Trees are axed for timber, firewood, cattle ranching and for several other purposes.

- wherein

Slash and burn agriculture, commonly called as Jhum cultivation in the north-eastern states of India, has also contributed to deforestation.

 

Sanitary landfills -

Sanitary landfills were adopted as the substitute for open-burning dumps

.

- wherein

In a sanitary landfill, wastes are dumped in a depression or trench after compaction, and covered with dirt everyday.

 

Effect of UV light -

UV radiation of wavelengths shorter than UV-B, are almost completely absorbed by Earth’s atmosphere, given that the ozone layer is intact. But, UV-B damages DNA and mutation may occur

- wherein

It causes aging of skin, damage to skin cells and various types of skin cancers. In human eye,cornea absorbs UV-B radiation, and a high dose of UV-B causes inflammation of cornea, called snow-blindness, cataract, etc. Such exposure may permanently damage the cornea.

 

Eutrophication- Nutrient enrichment

Sanitary landfill - Waste disposal

Snow blindness - UV-B radiation

Jhum cultivation - Deforestation

 


Option 1)

a b c d
iii iv i ii

 

This is correct.

Option 2)

a b c d
i iii iv ii

This is incorrect.

Option 3)

a b c d
ii i iii iv

This is incorrect.

Option 4)

a b c d
i ii iv iii

This is incorrect.

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