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    Plant Growth and Development
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    Which hormone promotes the elongation petiole in deep rice plant ?
    Ehtylene 
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    What is C/N ratio ?
    C/N ratio is the ratio of carbohydrates and nitrogenous compounds which regulate the growth in plants. 
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    Which is antigibberellin hormone?

    ABA -Abscisic acid. 
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    Who isolated auxin and from where ?

    Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.

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    Name the phytohormone which is a derivative of purines ?
    Cytokinins.
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