Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution

પાણીમાં ઇ.કોલાઇની હાજરી એ _______ દૂષણનું સૂચક છે.

1
ગટર
2
તેલ
3
જંતુનાશક
4
નીંદણનાશક 
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