write ten small leaves
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Introduction:
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The leaf is one of the most important parts of a plant. Leaves produce food for the plant through a process called photosynthesis. The leaves of different plants vary widely in size, shape, and color.
Structure:
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Most leaves have a broad, flat part called a blade. Usually, a stalk called a petiole attaches the blade to the plant’s stem. A leaf that has only one blade is called a simple leaf. A compound leaf has two or more blades attached to the petiole.
Veins inside a plant’s leaves work much like blood vessels inside an animal’s body. They carry water and food to and from the leaves. Veins also provide the strong support that gives a leaf its shape. The veins of broad leaves usually form a netlike pattern throughout the leaf. Narrow leaves usually have veins that lie parallel to each other.
Different types of leaves may be rounded, oval, spear shaped, heart shaped, or triangular. Some leaves look almost like fingers on a hand. Others are shaped like needles. Some leaves have smooth edges. Other leaves have tiny points, called teeth. Leaves may also have waxy or hairy coverings for protection.
Photosynthesis:
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Inside all leaves are substances called pigments, which give leaves their colors. Green leaves get their color from a green pigment called chlorophyll. Chlorophyll helps with the job of photosynthesis. It absorbs energy from sunlight. The leaves use this energy to make sugars, which are food for the plant.
Falling leaves:
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Plants lose leaves and grow new ones throughout their lives. But many trees, called deciduous trees, shed all their leaves during cold or dry seasons. Trees do this because they stop growing during these times.
In autumn or during a dry season, the leaves of deciduous trees lose their chlorophyll. As the leaves’ green color fades, red, yellow, or orange pigments become visible. Meanwhile, a weak layer of cells develops at the base of each leaf’s petiole. This weak layer causes the leaf to loosen and then fall off. The leaves grow back when the seasons change again.
Uses:
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Humans have found many uses for leaves. Herbs, such as rosemary, thyme, and sage, are leaves that are used to flavor food. Tea is made by soaking the leaves of the tea plant in hot water. Some leaves have medicinal uses. For instance, the leaves and flowers of the snapdragon plant are used to reduce fever and inflammation.
Leaves that have fallen on the ground are a rich source of carbon and other nutrients. These leaves can be used to provide nutrients for shrubs, trees, flowers, and vegetable gardens. They can also be shredded and used in a compost pile.
Leaves can also be harmful. The leaves of the poison oak and poison ivy plants produce oil that cause a rash or pain.
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