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Question

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?

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Solution

  • The test tube A will have the highest concentration of carbon dioxide. The carbon dioxide(CO2) comes because of respiration by the snail. Snail is an organism that breaths in O2 and breaths out (CO2).Hence,(CO2 concentration increases in test tube A.
  • The test tube B contains a water plant, which takes is (CO2) for photosynthesis and gives out O2.Hence, more O2 concentration is seen in test tube B.
  • The test tube C contains both snail and a water plant. The CO2) produced by the snail is utilized by the plant for the photosynthesis and the O2 released by the plant is utilized for snails respiration.
  • Therefore The test tube A will have the highest concentration of carbon dioxide.

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