What is the characteristic feature of the Haustorial roots of Cuscuta?

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Presence of both xylem and phloem

Presence of Only phloem

Both 1 & 2

None of the above

answer is A.

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Detailed Solution

Concept: Cuscuta is a total parasite and wraps itself upon the stem of the host cells. It lacks both xylem and phloem.
These types of roots are present in the parasitic plants. The parasites develop the adventitious roots from the stem that penetrate into the tissue of the host plant and suck nutrients. Such a type of root is found in plants like Cuscuta (commonly called dodder), Cassytha, Orobanche (commonly called broomrape), Viscum (commonly called mistletoe), Dendrophthoe. It depends upon the host for both food and water. Thus, Cuscuta has both xylem and phloem.
Hence, option 1 is the correct answer.

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