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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v):

Frothing in Yamuna:

 

 

The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghats and households. Yamuna’s pollution level is so bad that parts of it have been labelled ‘dead’ as there is no oxygen in it for aquatic life to survive.

 

(iv) High content of phosphate ion in river Yamuna may lead to:
1 decreased level of dissolved oxygen and increased growth of algae.  
2 decreased level of dissolved oxygen and no effect of growth of algae.  
3 increased level of dissolved oxygen and increased growth of algae.  
4 decreased level of dissolved oxygen and decreased growth of algae.  

Ans.

(1)