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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 : 39
Total: 98
Why does test-tube ' B ' have more bubbles of oxygen?
Solution:  
Rate of photosynthesis is more in test tube B because the plant in B gets more CO2 from the snail.
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