Transcription of UNIT 2 - NCERT
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UNIT 2 - NCERT
UNIT 2. STRUCTURAL ORGANISATION. IN PLANTS AND ANIMALS. Chapter 5 The description of the diverse forms of life on earth was made only by Morphology of observation through naked eyes or later through magnifying lenses Flowering Plants and microscopes. This description is mainly of gross structural features, both external and internal. In addition, observable and perceivable Chapter 6 living phenomena were also recorded as part of this description. Before Anatomy of Flowering experimental biology or more specifically, physiology, was established Plants as a part of biology, naturalists described only biology.
petiole help hold the blade to light. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. There is, usually, a middle prominent vein, which is known as the midrib.
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