plants parts and classification
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Most plants have three parts: roots, the stem and leaves.The ROOTS hold the plant in the ground. Roots absorb water and minerals that the plant needs to survive.The STEM supports the leaves of a plant, and distributes the water, minerals and the food the plant makes to the rest of the plant.There are two types of stems: -Herbaceous stems are soft and green. For example, grass and weeds.
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-Woody stems are hard. For example, trees and shrubs (bushes) have a woody stem called trunk.
The LEAVES make food for the whole plant. Each leaf is composed of a thin sheet called a blade. The blade has veins. The leave is attachedto the stem by a petiole.The trees that lose their leaves completely in autumn are called deciduous, for example oaks.
The trees that keep their leaves all year round are called perennial or evergreen.
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Plants can be classified into two main groups : 1) FLOWERING plants. These have organs like flowers, fruits and seeds that help them to reproduce. There are two types:
1-Angiosperms, like apple trees, are plants that grow fruit with seeds. The seeds are inside the fruit.
2-Gymnosperms, like pine trees, have seeds inside flowers (pine cones) but do not have fruit.
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2) NON-FLOWERING plants. These have no seeds. They reproduce by spores. -Ferns have roots, leaves, stems and spores in the leaves.
-Mosses do not have roots, leaves or stems. Spores are produced in capsules.
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