Like animals, plants need to breathe. The stomata on the leaves are like the nostrils and mouths of animals, through which air can enter and exit. Inhaled gas can spread to all parts of trees to meet the needs of growth. There are more important things! There are small green particles called chloroplasts in the leaves of plants. It has a special power to carry out photosynthesis and make food for itself, which is also the difference between plants and animals. Plants absorb carbon dioxide from the air through the pores on the leaves, absorb water from the soil through the roots, and then transport the water to the leaves. Carbon dioxide and water meet in chloroplasts and are transformed into starch and other nutrients under the irradiation of sunlight for plant growth. Therefore, leaves are green factories for plants. It can be seen that leaves are very important for the growth of trees. Trees can hardly survive without leaves.