Q.4 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 ?


Answer :

Test-tube A will have the highest concentration of CO2 because :

(1) Test-tube A will have a snail that expels out CO2 into the tube. Living organisms use oxygen and release CO2 during respiration.

(2) Since a plant is present in both test tubes B and C, the plant will inhale CO2 to decrease CO2 concentration.

(3) Thus, there will be less concentration of CO2 in B and C test tubes.

NCERT solutions of related questions for Respiration in Organisms

NCERT solutions of related chapters class 7 maths

NCERT solutions of related chapters class 7 science