Question

Plants take carbon dioxide from the atmosphere mainly through their:

• A. roots
• B. stems
• C. flowers
• D. leaves

Answer 1

The correct option is D

leaves

The correct option is D

Explanation of the correct option:

1. The gaseous exchange in plants takes place through tiny openings known as stomata.
2. The opening and closing of stomata depend upon the surrounding conditions of the environment which is possible with the help of guard cells.
3. Stomata are present on the epidermis of leaves.

Explanation of the incorrect options:

Option A:

1. Stomata are absent in roots, therefore no gaseous exchange occurs.
2. Photosynthesis does not occur in the roots of the plants so they don’t take carbon dioxide.

Option B:

1. There may be some stomata present in stems through which gaseous exchange may occur.
2. The rate of photosynthesis is very low in a stem so a very less amount of carbon dioxide comes through it.

Option C:

1. The stomata present in some flowers are dysfunctional.
2. So no exchange of gas in flowers.

Final answer: Plants take carbon dioxide from the atmosphere mainly through their leaves.