An air-pump is kept in an aquarium in order to (CTET Jan 2012) – McqOptions

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1.	An air-pump is kept in an aquarium in order to (CTET Jan 2012)
A.	provide more carbon dioxide to water plants
B.	allow more oxygen to dissolve in water
C.	enhance the beauty of the aquarium
D.	make water cleaner'
Answer» C. enhance the beauty of the aquarium

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