Explanation: Photosynthesis is a fundamental biological process that occurs in plants, algae, and certain bacteria. It is the process by which these organisms convert light energy into chemical energy, which is stored in the form of glucose. This process is crucial for the survival of plants and plays a significant role in the Earth's ecosystem.
The process of photosynthesis can be summarized by the following chemical equation:
\[ 6CO_2 + 6H_2O + light \rightarrow C_6H_{12}O_6 + 6O_2 \]
In this equation, carbon dioxide (CO₂) and water (H₂O) are the reactants, and glucose (C₆H₁₂O₆) and oxygen (O₂) are the products. The light energy is absorbed by chlorophyll, a green pigment found in the chloroplasts of plant cells, which acts as the catalyst for the reaction.
During photosynthesis, the light energy is captured and used to split water molecules into hydrogen and oxygen. The hydrogen is then used to convert carbon dioxide into glucose, while the oxygen is released as a byproduct. This oxygen is essential for the survival of most living organisms, as it is used in the process of cellular respiration to produce energy.
The oxygen released by plants during photosynthesis is a critical component of the Earth's atmosphere. It is the primary source of the oxygen that animals, including humans, breathe. The process of photosynthesis not only provides oxygen but also helps in reducing the levels of carbon dioxide in the atmosphere, which is a greenhouse gas that contributes to global warming.
It is important to note that while plants release oxygen during photosynthesis, they also consume oxygen during the process of cellular respiration, which occurs continuously. However, during the day, when photosynthesis is active, the rate of oxygen production exceeds the rate of consumption, resulting in a net release of oxygen into the atmosphere.
In summary, the gas released by trees through photosynthesis is oxygen. This process is vital for the maintenance of the Earth's atmosphere and the survival of most living organisms. Understanding the process of photosynthesis and the role of oxygen in this process is essential for comprehending the ecological balance and the interdependence of living organisms on Earth.