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The shape of leaves and canopy of trees is such that it ensures best conditions for the nourishment of trees. |
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Trees grown under condition of competition are comparatively straight and tall with a long trunk and a restricted crown. |
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Flowers are the reproductive organs of the tree, they contain stamens which produce pollen (containing male sex cells) and a pistil ( containing the ovules - the female sex cells which develop into seeds.) |
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Trees and shrubs are perennials, i.e. they do not die in winter. |
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Atmospheric carbon-dioxide is the tree's main source of food, together with water, chlorophyll and sunlight.This is processed by the leaf into organic compounds, through which the tree obtains nourishment. |
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The size, structure, colour and scent of a flower help to ensure that pollination takes place. |
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The variety of flower structures in the trees reflects the different ways in which the flowers are pollinated. |
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A tree is a self-sustaining ecosystem having all the abiotic and biotic components. |
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Trees grow in length by division of the cells at the tip of their shoots; they grow in thickness by the production of wood. |
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Roots not only anchor the tree to the ground, but also absorb water and nutrients dissolved in it, and serve as storage for the food supplies. |
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Plants, animals and people all need each other. Plants make oxygen that people and animals breathe; people and animals exhale carbon dioxide that plants need to live on. |
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Plants and trees help to reduce air pollution by absorbing some pollutants from the air. |
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Many forests are cleared each day to make land available for roads, car parks, homes and businesses. |
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If every person planted a couple of seeds, there would be more than 100 million more plants growing every year making the earth a healthier place to live in. |
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It takes years for a tree to grow for making paper. It takes many forests to make paper that we use.and throw away. |
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The British use 81/2 million tons of paper every year-that is equivalent to 90 million trees. |
