Question

Take a test -tube. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, water plant in test-tube B and C, keep snail and plant both. Which test-tube would have the highest concentration of CO2​

Answer 1

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Test tube A will have the highest concentration of $CO_2$ because test tube A will have snail which expels out $CO_2$ into the tube,in tube C, there is a plant which inhale $CO_2$ to decrease $CO_2$ concentration in tube C.