Weed plants which grow on other plants without deriving nutrients from them are called

Explanation

Weed plants that grow on other plants without deriving nutrients from them are called epiphytes. Epiphytes are plant that grow on other plants, but unlike parasites, they do not derive nutrients from their hosts. They only use the host plants for physical support. Sedge is a type of grass-like plant, decomposers are organisms that break down dead or decaying organisms, and saprophytes are organisms that feed on decaying organic matter.