PLANTS parts and classification

Post on 15-Feb-2017

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Transcript of PLANTS parts and classification

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.

-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.

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.

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.