The correct answer is option 3: Cuscuta. Cuscuta is a type of plant known as a root parasite. Root parasites do not have chlorophyll and therefore cannot photosynthesize and produce their own food. Instead, they depend on other plants for nutrients and water. Cuscuta attaches itself to the roots of other plants, such as trees, shrubs, and even crops, and extracts nutrients from them. It forms twining stems that wrap around its host plant and absorbs water and inorganic nutrients directly from the host`s xylem tissue. The host plant suffers from reduced growth and yield as a result of being parasitized by Cuscuta. Ficus, Santalum, and Euphorbia are not examples of root parasites, so options 1, 2, and 4 are incorrect.