Take three test-tubes. Fill each of them with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?


The test tube A will have the highest concentration of carbon dioxide CO2, because snail breathes out carbon dioxide during respiration.


The test tube B contains a water plant, which breath in CO2 for photosynthesis and breathe out O2​. Hence,​ the concentration of O2 is seen in test tube B.


The test tube C contains both snail and a water plant, where the CO2 released by the snail is utilized by the plant for the photosynthesis and the O2 ​released by the plant is utilized by snail for respiration. 


Hence, the test tube A will have the highest concentration of carbon dioxide.


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Updated on: 27-Mar-2023

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