Answer:
Mycorrhiza (Myco's =
fungus, rize = roots) is a symbiotic association between fungus and the roots
of vascular plants. The fungus colonizes the roots of the host either infra or
inter cellularly. It helps in the nutrient absorption from soil for the plant,
Mycorrhizal associations are present in conifers, i.e., Pinus, Cedrus, Abies
and Picea.
Coralloid roots is
develop in Cycas. It is produced in clusters at the base of the stem and protrudes
out over the ground. It is dichotomously branched and greenish in colour. IT contains
algal zone in cortex. This algal zone contains blue green algae like Anabaena
and Nostoc which grow in symbiotic association with coralloid roots.
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