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ICSE Class X Biology 2015 Solved Papers

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SECTION - II

The diagram alongside shows two test-tubes A and B. Test-tube A contains a green water plant. Test-tube B contains both a green water plant and a snail. Both Test-tubes are kept in sunlight. Answer the questions that follow :
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Question : 38
Total: 98
What is the purpose of keeping a snail in test-tube ' B '?
Solution:  
So that snail can release carbon di oxide into the water for plant.
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