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Parasitic roots - Adventitious roots from the nodes of these plants penetrate into the host tissue (via peg-like projections called haustoria) and enter into its conducting tissue (water-conducting and food-conducting) to acquire their nutrition.

Mycorrhizae - Fungus-roots or mycorrhizae are symbiotic associations between a fungus partner and roots of higher plants that benefits both the fungus and the root. The fungus facilitates the absorption of water and nutrients for the plant and the plant furnishes sugars and amino acids for the fungus.

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