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plants really don't eat in the way that animals eat. A better question would be, "How do plants make their own food?" Green plants get nourishment through a chemical process called photosynthesis, which uses sunlight, carbon dioxide, and water to make simple sugars. Those simple sugars are then changed into starches, proteins, or fats, which provide a plant with all the energy it needs to perform life processes and to grow.

Generally, sunlight (along with carbon dioxide) enters through the surface of a plant's leaves. The sunlight and carbon dioxide travel to special food-making cells (palisade) deeper in the leaves. Each of these cells contain a green substance called chlorophyll-which gives plants their green color-that traps light energy, allowing food-making to take place. Also located in the middle layer of leaves are special cells that make up a plant's "transportation" systems. Tubelike bundles of cells called xylem tissue carry water and minerals throughout a plant, from its roots to its outermost leaves. Phloem cells, on the other hand, transport the plant's food supply-sugar dissolved in water-from its manufacturing site in leaves to all other cells.

The plant food that we buy in stores is simply a mixture of minerals that plants need to grow well. These include nitrogen, phosphorus, and potassium. Usually a plant is able to get these things from the soil in which it grows, drawing them up with water through its roots. But gardeners, farmers, and other plant growers add to this natural mineral supply so plants can thrive.

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13y ago

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