While trees use carbon dioxide to produce their own food, they actually need oxygen (just like humans) to process those foods and convert them into energy. In order to use stored starch to grow, trees must convert sugars back into energy through a process called respiration. Plants need oxygen to survive, and plant cells use oxygen constantly. Under certain circumstances, plant cells need to absorb more oxygen from the air than they generate themselves.
So, if plants generate oxygen through photosynthesis, why do plants need oxygen? Trees release oxygen when they use energy from sunlight to produce glucose from carbon dioxide and water. Like all plants, trees also use oxygen when they break down glucose again to release energy that boosts their metabolism. With an average of 24 hours, they produce more oxygen than they consume; otherwise, there would be no net increase in growth. As sugar molecules break down, they release energy.
This process requires trees to absorb oxygen and release carbon dioxide. If you think it sounds like the opposite of photosynthesis, you're right. This process occurs in both leaves and stems. To eat, trees go through a process called photosynthesis.
To do this, its leaves extract carbon dioxide and water through small pores, called stomata, and use the energy absorbed by the sun to convert CO2 and H2O into sugars. We should have programs to replace these trees and also study ways to improve trees' fire resistance and carbon absorption capacity. Therefore, the power of a single tree can basically give oxygen to 4 people and when people breathe in oxygen and breathe out carbon dioxide, the process is interrupted only because of a tree that consumes carbon dioxide and gives oxygen to people. Trees that lose their leaves in autumn, such as chestnut, oak, poplar and maple trees, are called deciduous trees.