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| ==Reference Books== | | ==Reference Books== |
− | | + | *Refer 9th standard Science TamilNadu textbook from the following link [http://www.textbooksonline.tn.nic.in/Books/Std10/Std10-Science-EM-4.pdf page no 255- 340 Click here] |
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| = Teaching Outlines = | | = Teaching Outlines = |