Teaching Jharkhand (JSSC) PRT (1 to 5) Mock Test 2023 General Knowledge Ecology and Environment Environmental pollution

लाइकेन ________ का सबसे अच्छा सूचक हैं।

1
वायु प्रदूषण 
2
जल प्रदूषण 
3
मृदा प्रदूषण 
4
ध्वनि प्रदूषण 
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