During photosynthesis, which gas is primarily absorbed by plants?

During photosynthesis, plants primarily absorb carbon dioxide from the atmosphere. This process is essential for plants to produce glucose, which serves as an energy source. Carbon dioxide enters the plant through small openings in the leaves called stomata. Once inside the plant, it combines with water absorbed by the roots and, using sunlight as energy, undergoes a series of chemical reactions to produce glucose and oxygen.

The absorption of carbon dioxide is crucial for the photosynthetic process because it is one of the key reactants needed to synthesize carbohydrates. This makes it the driving force behind the creation of energy in plants, supporting growth and development. The oxygen produced is a byproduct that is expelled back into the atmosphere, which is vital for the survival of aerobic organisms, including humans.