A tree breathes through its leaves using chlorophyll, the substance that makes leaves green. Chlorophyll absorbs the carbon dioxide in the air and uses it alongside water to break down minerals absorbed through the tree'... More »

In dry air that does not contain pollution, the predominant gas is nitrogen, which makes up 78 percent of the atmosphere. The next two most voluminous gases are oxygen (21 percent) and argon (1 percent). Other gases appe... More »

One of the most important things that trees give people is oxygen to breathe. Trees also give shade, house animals and muffle noise. More »

Plant leaves turn yellow for a variety of reasons, including a lack of chlorophyll caused by too much or too little water, insufficient sunlight, temperature changes and disease. Plants contain various pigments such as c... More »

Plants produce food in their leaves through photosynthesis, a process that uses chlorophyll to synthesize sustenance through carbon dioxide, sunlight, water and mineral-related nutrients. Chemical energy from photosynthe... More »

When the abscission layer of a plant grows, it cuts off the circulation of nutrients, sugar and water to the leaves, which causes the chlorophyll that gives the plant its green color to disintegrate and makes carotene sh... More »

Plants need minerals to produce chlorophyll and go through photosynthesis, fight off diseases, produce fruit and leaves, and grow strong stems and branches. Certain minerals also support a plant's growth, seed production... More »