Answer
Option (d) Leaves
Plants take carbon dioxide from the atmosphere mainly through their leaves. Stomata are the small opening on the surface of the leaves.
What are stomata?
Stomata are the tiny openings present on the epidermis of leaves. In some of the plants, stomata are present on stems and other parts of plants. These pores open and close depending upon the surrounding conditions of the environment. They help in the gaseous exchange during the photosynthesis and respiration processes. Closing and opening of stomata are possible with guard cells present in stomata which carry out this process by accumulating and draining out the water in them.
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