Microcheck 305

Mycorrhizal fungi gain nutrients from plant root secretions while helping plants take up substances from soil. Symbiotic nitrogen-fixers provide plants with a source of usable nitrogen while being provided with an exclusive habitat. Microorganisms in the rumen and cecum of herbivores digest cellulose and hemicellulose, enabling the animal to subsist on plant material while being provided a nutrient-rich habitat.

■ Describe the differences between endomycorrhizae and ectomycorrhizae.

■ Describe the differences between a rumen and a cecum.

■ Gardeners sometimes plant clover between productive growing seasons. Why would this practice be beneficial?

Summary 781

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