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- The nutrition of some plants is enhanced by a mutually beneficial association between a root and a fungus. The association is known as _________. a. root nodule c. root hair b. mycorrhiza d. hyphaSieve tubes are part of ___________. a. cortex c. phloem b. mesophyll d. xylemWhy weeds are harmful? What makes the weeds successful? Enlist methods to control weeds.
