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of plant tissues, similar to benign tumors or warts in animals.They can be caused by various parasites, from fungi and bacteria, to insects and mites.

Nodules are loosely attached to the root, while root-knot galls originate from infection at the center of the root, so they are an integral part of the root.The meristems, where plant cell division occurs, are the usual sites of galls, though insect galls can be found on other parts of the plant, such as the leaves, stalks, branches, buds, roots, and even flowers and fruits.Gall-inducing insects are usually species-specific and sometimes tissue-specific on the plants they gall.Galls act as both the habitat and food source for the maker of the gall.The interior of a gall can contain edible nutritious starch and other tissues.

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