**5. Mycorrhizas as nutritional mutualisms**

Mycorrhiza is a symbiotic relationship between plants and fungi in which both get to benefit from each other; fungi provide all nutrient availability to plants and in return get food or photosynthetic material. The union of many dissimilar systems of mycorrhizas is a testimony to the shared benefits of these enterprises. Resource exchange in mycorrhizas can be observed, and for the inspection of exchanged resources among both partners, different tools are being used. MF is considered more efficient in exploring soil and uptake of nutrients for plants as compared to plant roots. The large size of soil is inhibited by MF that spreads far away from the nutrient reduction zone that develops around roots [11]. About external hyphae of ECM, it is assessed that it may increase the surface area up to 60-fold on average. Nutrients from soil pore spaces are extracted by the small diameter of fungal hyphae that is too small for plant roots to perform its activity [12].
