Discussion
Which free living microorganisms occupy a niche to feed primarily on organic detritus from dead organisms and unable to adapt to the body of live host ?
Answer: A
These are obligate saprobic microorganisms.
Saprobes (saprophytes) feed on dead organic matter, secreting enzymes to digest detritus and absorbing the products. An obligate saprobe lives only in this way and cannot adapt to a living host.
Parasites live on a living host, and facultative parasites can live either as saprobes or as parasites, so both can use a live host. Auxotrophs are mutants that require a nutrient the wild type can make; the term describes nutritional requirements, not where an organism feeds.
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