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Lichens are symbiotic associations between algae and fungi.
The algal component is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic respectively.

Root Nodules:
They are the nodules found on the roots of leguminous plants.
They help in nitrogen fixation.

They are the organisms which depend on other organisms for food/shelter/water.
They are harmful to the host organism and may even cause diseases in some.

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Lichen  Lichens are symbiotically associated organisms, namely fungus and an alga.
parasite - non green plants that obtain food fm other green plant
root nodules-
Root nodules are basically small sacks filled with Nitrogen. Most legume plants are nitrogen fixating