(B) The root hairs are unicellular,tubular extensions of the epidermal cells of the root,which are specifically known as the $Epiblema$ or $Piliferous

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(B) The root hairs are unicellular,tubular extensions of the epidermal cells of the root,which are specifically known as the $Epiblema$ or $Piliferous$ layer.These hairs are responsible for the absorption of water and minerals from the soil.Therefore,the correct option is $B$.