Mycorrhiza - Mycorrhiza is a symbiotic association of fungi with roots of plants, so that the nutrients absorbed from soil by the fungus are released to the host cells and in turn, the fungus takes its food requirements from the host. Mycorrhizae are of two types:
(i) ectomycorrhiza, and
(ii)endomycorrhiza.
Ectomycorrhiza arc found on the roots of forest trees (e.g. pine, oak, beech, eucalyptus, etc.). They absorb nitrogen, phosphorus, potassium and calcium. They also convert complex organic molecules  into simpler available forms, protect the roots from the pathogens, and produce growth promoting substances (cytokinins).