Root development is promoted by

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(D) The correct answer is $D$. Ethylene is a gaseous plant hormone that plays a crucial role in root development. It promotes root growth and the form

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ethylene

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(D) The correct answer is $D$. Ethylene is a gaseous plant hormone that plays a crucial role in root development. It promotes root growth and the formation of root hairs,which increases the surface area for water and mineral absorption. In low concentrations,ethylene is specifically used for the initiation of roots and the development of lateral roots.

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