Which gas do plants absorb from the atmosphere?

Plants absorb carbon dioxide from the atmosphere, which is essential for the process of photosynthesis. During photosynthesis, plants take in carbon dioxide through small openings in their leaves called stomata. This gas is then used, along with sunlight and water, to produce glucose and oxygen. Glucose serves as a vital source of energy for the plant, while the oxygen generated is released back into the atmosphere, contributing to the air we breathe.

Oxygen, although produced by plants during photosynthesis, is not absorbed by them. Carbon monoxide, while it can be present in the atmosphere, is a harmful gas and does not play a role in photosynthesis. Nitrogen is essential for plant growth, but it is typically absorbed in a different form, such as nitrates, rather than directly from the atmosphere in its gaseous state. Thus, carbon dioxide is the key gas that plants need for their survival and energy production.