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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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Name the phytohormone which is a derivative of purines ?

Cytokinins.
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Which hormone promotes the elongation petiole in deep rice plant ?

Ehtylene 
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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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