Mycorrhizal Association : (a) The mycorrhiza is "symbiotic association of a fungus with a root." Fungal filaments form a network around young root.
(b) They penetrate the root cells. Fungal hyphae have a very large surface area that absorb mineral ions and water from the soil from a much larger volume pf soil.
(c) Fungus provides minerals and water to the roots.
(d) The roots provide sugars and N2-containing
compounds to mycorrhizae. Some plants possess an obligate association with these mycorrhizae e.g., Pinus seeds do not germinate; and establish without mycorrhizae.