For decades, botanists regarded forest trees as solitary combatants locked in a silent, slow-motion struggle for sunlight and soil nutrients. This competitive paradigm, however, has been challenged by the discovery of subterranean mycorrhizal networks. These networks, formed by symbiotic fungi threading through the root systems of multiple species, act as conduits for sharing chemical resources. Through these fungal pathways, older, dominant 'mother trees' direct surplus carbon, water, and nitrogen to struggling, younger seedlings shaded by the forest canopy. Rather than behaving as passive bystanders, the fungi manage this resource distribution to preserve the overall health of the forest community, upon which the fungi themselves depend. Consequently, trees within a shared ecosystem cooperate to buffer one another against environmental stress.
According to the passage, which of the following statements best describes the role of fungi within mycorrhizal networks?
- They actively direct the flow of nutrients to maintain the well-being of the forest ecosystem because their own survival depends on it.Answer
- BThey function as passive conduits, allowing older trees to distribute resources to seedlings without fungal intervention.
- CThey extract carbon and water from younger seedlings and redirect them to support the survival of the older mother trees.
- DThey prioritize the health of individual trees over the stability of the broader forest community to protect their symbiotic partnership.