Plants get carbon dioxide from the air.

Explanation:
Carbon dioxide is one of the essential ingredients for photosynthesis, the process through which plants produce their own food. Plants absorb carbon dioxide from the air through tiny pores called stomata, which are present on the surface of their leaves and stems.

Process of Carbon Dioxide Absorption:
1. Stomata: Stomata are small openings on the surface of leaves and stems that allow gases, including carbon dioxide, to enter and exit the plant.
2. Gas Exchange: When the stomata open, carbon dioxide from the air outside the plant enters the leaf through the stomata.
3. Diffusion: Carbon dioxide molecules move from an area of high concentration (outside the leaf) to an area of low concentration (inside the leaf).
4. Transport: Carbon dioxide is then transported to the chloroplasts, the site of photosynthesis, where it is used to produce glucose and other organic compounds.
5. Release of Oxygen: As a byproduct of photosynthesis, oxygen is released back into the air through the stomata.

Importance of Carbon Dioxide:
Carbon dioxide is crucial for photosynthesis as it provides the carbon atoms necessary for building glucose molecules, which are used to store energy in plants. Without carbon dioxide, plants would not be able to produce their own food, and the entire ecosystem would be greatly affected.

Other Sources of Carbon Dioxide:
While the primary source of carbon dioxide for plants is the air, they can also obtain small amounts of carbon dioxide from the soil. When organic matter in the soil decomposes, it releases carbon dioxide, which can be absorbed by plant roots. However, the majority of carbon dioxide required by plants is obtained from the air.

In conclusion, plants get carbon dioxide from the air through their stomata, which are small openings on the surface of leaves and stems. This carbon dioxide is essential for photosynthesis, allowing plants to produce their own food and release oxygen back into the atmosphere.

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