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

Weed plants which grow on other plants without deriving nutrients from them are called epiphytes. Epiphytes are plants that grow on other plants, but they do not depend on them for their nutrients. Instead, they derive their nutrients from the air, rain, and debris that accumulates around them. This allows them to live in areas where the soil is poor or non-existent, such as in the canopies of trees. Sedges are a type of grass-like plant that typically grow in wet areas, decomposers are organisms that break down dead organic matter, and saprophytes are plants that obtain nutrients from dead or decaying matter. Therefore, the most appropriate option for the given question is "epiphytes".