Question

V. Prove that the air we breathe out is rich in carbon dioxide with
the help of an activity.​

Answer 1

Take one balloon and fill it by air.Then, take a plant and keep it in the room which has no air keep it for 3 to 4 days then, you will see that the plant's leaves are getting dry then, take another plant and place it inside the balloon which you have filled with air then keep it in the same room for 3 to 4 days then, you will see that this plant's leaves does not dry because the carbon dioxide present in the air helps in photosynthesis.

Answer 2

Answer:

Take two glass tubes with limewater in them and label them as A and B. Leave tube A in the open air, undisturbed. Take a straw and breathe out the air in tube B. We will observe that the colour of limewater in tube B changes to milky white.

Limewater turns milky when carbon dioxide is passed through it. Therefore, it shows that the air we breathe out contains carbon dioxide.

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