(D) $Cuscuta$,$Viscum$ and $Orobanche$ are parasitic plants.These plants possess specialized root structures known as haustorial roots (or haustoria).

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(D) $Cuscuta$,$Viscum$ and $Orobanche$ are parasitic plants.These plants possess specialized root structures known as haustorial roots (or haustoria).These roots penetrate the tissues of the host plant to absorb nutrients,water,and minerals directly from the host's vascular system.