वायु प्रदूषण के विश्वसनीय – McqOptions

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1.	वायु प्रदूषण के विश्वसनीय संकेतक है -
A.	हरी शैवाल तथा जलीय लीवरवर्टस
B.	फर्न तथा साइकस
C.	लाइकन तथा मौस
D.	नीम तथा आम
Answer» D. नीम तथा आम

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