Mycorrhizal fungi have occurred naturally in the soil for 450 million years and form a close relationship with plant roots. Which among the following types of relationships exits between mycorrhizal fungi and plants?

Association between roots of higher plants e.g pine, birch and fungal hyphae is called mycorrhiza. It exhibits the phenomenon of symbiosis. Here both the organisms in association are mutually benefitted. In this, fungal hyphae take nutrition from the plant and in return increase surface area for absorption of water and minerals for the plant. Mycorrhizal roots occur in superficial layers of the soil.