Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Bacteria that live in the human intestine assist digestion and feed on nutrients the human consumed. This relationship might bestbe described as:

a. commensalism.

b. mutualism.

c. endoparasitism.

d. ectoparasitism.

e. predation

Summary Introduction


A community’s population lives together by interacting among themselves and following various symbiotic relationships. Symbiotic relationships are of three types, namely, mutualism, commensalism, and parasitism. In these, both species get benefited, only one gets benefited, and one gets benefited while other is harmed, respectively.


Justification/explanation for the correct answer:

Option (b) is given as mutualism. This is a kind of symbiotic relationship, which benefits both species interacting with each other. Bacteria in the human intestine help in digesting the food and in return they feed and derive their nutrition from the nutrients that the humans have consumed. Nitrogen fixing bacteria, fungi, and other microorganism have same relationships with plants. Hence, option (b) is correct.

Explanation for the incorrect answers:

Option (a) is given as commensalism. This is a type of symbiotic relationship in which one of the interacting species gets benefited. This does not harm the other species and it remains unaffected. So, it is an incorrect option...

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