Mycorrhiza is a symbiotic relationship between roots of higher plants and
Fungi
The correct option is option A.
Explanation of the correct option:
Explanation of the incorrect options:
Option B: Viruses are not found in symbiotic association with plants.
Option C: Bacteria are found in symbiotic association with plants but it is not called Mycorrhiza.
Option D: Some Blue green algae are found in the roots of plant it is called collaroid root.
Final answer: Mycorrhiza is a symbiotic relationship between roots of higher plants and fungi.