Option 1 states that the Sandalwood plant is a partial root parasite. This means that the Sandalwood plant obtains some nutrients from another plant by attaching its roots to the host plant. This is a true statement, as Sandalwood is indeed a partial root parasite.

Option 2 states that Cuscuta is a parasite. This is correct, as Cuscuta, commonly known as dodder, is a parasitic plant that attaches itself to another plant and derives nutrients from it.

Option 3 states that Nepenthes is carnivorous. This is also true, as Nepenthes, commonly known as the tropical pitcher plant, lures and captures insects in its pitcher-shaped leaves to obtain nutrients.

Option 4 states that mushrooms are autotrophs. However, this is not correct. Mushrooms are actually heterotrophs, as they obtain nutrients by decomposing organic matter in their surrounding environment. They do not have chlorophyll and are unable to perform photosynthesis, which is a characteristic of autotrophs.

Therefore, the correct answer is option 4, as mushrooms are not autotrophs.