Mycorrhiza is an example of:

A mycorrhiza is a symbiotic association between a green plant and a fungus. The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus, and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil. Related Theory Mycorrhizae permits the plant to obtain additional moisture and nutrients. When mycorrhizae are present, plants are less susceptible to water stress.