living hosts; or they may live in symbiotic relationships with algae or with the roots of higher plants. In spite of these variations, however, all fungi carry out extracellular digestion: they secrete enzymes that digest organic matter, and then they absorb the resulting nutrients.
包括最简单的多细胞生物在内,真菌大概有175,000种。真菌有多种生命形式。他们可能是分解无生命的腐生菌;也可能是寄生菌;或者与藻类共生,或者与高等植物共生。不管如何变化,所有真菌都是细胞外消化。他们分泌酶消化有机物,然后吸收有效的营养物质。
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