Nature - is what surrounds us, why did not touch a human hand. As we know, nature is animate and inanimate. Wildlife is divided into 5 kingdoms: bacteria, protozoa, fungi, plants and animals. Probably all of you know what the plant. That organisms which are building blocks for their cells using the energy of sunlight. This process is called photosynthesis. Photosynthesis occurs in special structures of plant cells - in the chloroplasts, which contain the green pigment - chlorophyll, coloring the leaves and stems of plants in green. Inorganic substances (water and carbon dioxide) in the process of photosynthesis are converted into organic substances - sugar and starch - the same building blocks of plant cells. During this plant producing oxygen, which is so essential to all living beings. That's why for us is so important plant world, because the Earth's flora - a "light" of our planet. Most plants have a stem, root and leaves. Escape is called the stem with leaves. The stem of a tree called a barrel. Plants are due to its leaves and roots. With their help, the plant eats: the roots of the land fed by moisture and minerals, and in the leaves is photosynthesis. Moreover, the roots help plants stay on the ground. Speaking of plants, we note the difference in appearance of plants, calling some of them trees, other herbs. Plant life-form - it is their appearance. Consider these forms. Trees - a plant for which there is a long-term lignified stem. Among the trees, the average height is 20-30 m, there are the giants - up to 100-200 meters (eucalyptus, redwoods), and dwarfs, whose height is about 50 cm (dwarf birch, and Welwitschia). Other life forms of plants - shrubs - trees are different from those that have several Stalks: the main trunk is absent, shoots branch out from the surface of the earth. These plants, like lilacs are hazel bushes. Undershrub called stunted plants with lignified branching rhizomes, hidden under the ground. By undershrub include blueberries, cranberries, heather. Liana - plants with curly or scansorial shoots, which is needed for growth support. These include ivy and grapes. Herbs, or herbaceous plants represent the largest number of species. Herbs - is annual or perennial plant with succulent soft not lignified shoots. Herbs are usually low, but among them there are giants do not yield to the growth of trees, such as papyrus (up to 7 m) or banana (15 m).