Take three test tubes. Fill 3/4th of each 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 the snail and plant both. Which test tube would have the highest concentration of CO2?

The amount of carbon dioxide (CO2) in our bodies regulates breathing. When carbon dioxide levels reach a specific level, a signal is delivered from your brain stem's breathing center to your breathing muscles, causing an inhale. We expel carbon dioxide as we exhale, and a new breathing cycle begins.

It is required for the survival of the majority of living species and ecological cycles, including respiration (aerobic and anaerobic), photosynthesis, and combustion. Carbon dioxide, one of the greenhouse gases, plays an essential function in regulating the Earth's temperature.



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


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


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


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

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Updated on: 09-Jan-2023

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