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Please answer question number 20

Dear student.
 
Mycorrhizae is the symbiotic association between the fungi and the roots of some plants. Mycorrhizal roots show a wooly covering and lack root caps and root hairs unlike normal roots. The fungal partner obtains nourishment from the cortical cells of the root and also depends upon the plant for shelter. The mycorrhizal hyphae help in increasing the surface area for absorption, so enable the plants in getting the enhanced supply of water, nitrogen, phosphorus and other minerals from the soil.

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Mycorrhiza is a symbiotic association of fungi with the root systems of some plants. The fungal hyphae either form a dense network around the young roots or they penetrate the cells of the roots. The large surface area of the fungal hyphae is helpful in increasing the absorption of water and minerals from the soil. In return, they get sugar and nitrogenous compounds from the host plants. The mycorrhizal association is obligate in some plants. For example, Pinus seeds do not germinate and establish in the absence of mycorrhizal.
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