Concept:Mycorrhiza is a symbiotic relationship between plant roots and fungi that improves the plant’s nutrient uptake.
Explanation:Mycorrhizal fungi extend fine hyphae into the soil, increasing the root’s surface area.
This helps the plant absorb more water and inorganic ions, especially phosphate and nitrate, from the soil.
In return, the fungus receives carbohydrates from the plant.
Because mineral absorption is improved, the plant grows better.
Mycorrhiza does not mainly fix atmospheric nitrogen, protect the plant from infection, or act as a growth regulator.
Answer:A. absorbing inorganic ions from the soil