Which of the following rivers is called biological desert on account of its pollutants ?

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Q: 138 (UPPSC/2012)

Which of the following rivers is called ‘biological desert’ on account of its pollutants ?

question_subject: 

Geography

question_exam: 

UPPSC

stats: 

0,14,77,65,8,14,4

keywords: 

{'biological desert': [0, 0, 0, 1], 'rivers': [3, 2, 8, 8], 'pollutants': [1, 0, 0, 2], 'periyar': [1, 0, 0, 0], 'yamuna': [9, 2, 3, 4], 'mahanadi': [18, 2, 10, 16]}