Plants absorb carbon dioxide (CO2) from the atmosphere during photosynthesis. This process is vital for their growth and development, as they use sunlight, carbon dioxide, and water to produce glucose and oxygen. The absorbed carbon dioxide is converted into organic compounds, which serve as energy sources for the plant, while oxygen is released back into the atmosphere. This exchange of gases is crucial for maintaining ecological balance and supporting life on Earth. Without photosynthesis, plants would not survive, and consequently, the entire food chain would be affected.