What are mycorrhiza and coralloid roots? Explain.

(N/A) Mycorrhiza and coralloid roots are examples of symbiotic associations in plants.
$1$. Mycorrhiza: It is a symbiotic association between a fungus and the roots of higher plants (e.g.,Pinus). The fungal hyphae help in the absorption of water and minerals from the soil,while the plant provides carbohydrates to the fungus.
$2$. Coralloid roots: These are specialized,branched,coral-like roots found in some gymnosperms,such as Cycas. These roots are associated with nitrogen-fixing cyanobacteria (e.g.,Anabaena or Nostoc),which help the plant in nitrogen fixation.