Which statement is NOT a function described for mycorrhizal associations?

• A. Dig trenches in soil to aerate it
• B. Increase root absorption of water and nutrients
• C. Extend life of root tips
• D. Release acids to break down soil compounds

Answer: (A)

Mycorrhizal associations expand the root system’s reach by sending fungal hyphae beyond the root hairs, greatly increasing the surface area for taking up water and nutrients, especially phosphorus. They also help deliver those resources to the plant and can release organic acids that solubilize minerals, making nutrients more available. In return, the plant provides carbohydrates to the fungi. These relationships can also help protect root tips and support their health, contributing to longer-lasting, more functional roots. Digging trenches in soil to aerate it is not something the mycorrhizal fungi do; physical soil aeration comes from soil management practices, not from the symbiotic relationship. So, the statement about digging trenches to aerate soil is not describing a function of mycorrhizal associations.