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ICSE Class X Biology 2020 Papers

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Give the biological reasons for the following statements :
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Question : 52 of 97
Marks: +1, -0
It is advisable to keep green plants in an aquarium.
Solution:  
Green plants perform photosynthesis and keep on releasing oxygen into the water. The dissolved oxygen is used up by the fishes in the aquarium.
In turn the CO2\mathrm{CO}_2 released by fishes is used up by plants for photosynthesis.
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