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Unformatted text preview: own, or prefer to obtain water and nutrients from some other plant than from the soil. Root-like structures called haustoria penetrate other plant tissues to obtain needed materials. Root Nodules Some legumes, and a few other plants, produce root nodules, which contain bacteria or cyanobacteria that can "fix" nitrogen (make nitrogen into a form that is useful as a plant nutrient). When the bacteria enter the root, they induce the root to form "tumors" which are the nodules. The bacteria then grow and produce the nitrogen products in the nodules. You can pull up clover and other herbaceous legumes and examine the conspicuous nodules on their roots....
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- Fall '09