ICSE Class X Biology 2020 Solved Papers

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Give the biological reasons for the following statements :
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Question : 52
Total: 97
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 released by fishes is used up by plants for photosynthesis.
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