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ICSE Class 9 Biology Question 9 of 10

Economic Importance of Bacteria — Question 2

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Question 2

Would there be any bacteria in an aquarium ?

Would there be any bacteria in an a aquarium ? Bacteria Economic Importance, Concise Biology Solutions ICSE Class 9.

(a) A balanced aquarium contains certain animals as well as some plants. How many kinds of animals can you make out in the aquarium shown here. Name any two such animals.

(b) Do you think there would be some bacteria in it? If so in which part of the aquarium would they be occurring in abundance and what for?

Answer

(a) Fishes and snails are present in the aquarium shown here.

(b) Yes, aquariums contain bacteria. A balanced aquarium contains some nitrifying bacteria like Nitrosomonas and Nitrobacter which converts the ammoniacal waste released by fish to nitrates. The filter media and various solid surfaces in the aquarium, such as gravel, rocks, plants, and decorations, harbor these bacteria in abundance.