Question

A type of relationship in which one organism is benefited while other is harmed is called
(a) Commensalism
(b) Mutualism
(c) Parasitism
(d) Symbiosis

Answer 1

Hint: In protozoans, such as malaria agents, sleeping sickness, and amoebic dysentery, a type of relationship in which one organism is enriched while the other is harmed is observed. The fleas or ticks which live on dogs and cats are other examples of this.

Complete step by step answer:
One species profits from parasitic relationships and the other suffers. In medical microbiology, most of the microorganisms examined are parasitic and feed on human tissue. Cholera, leishmaniasis, and giardia, for instance, are all attributed to parasitic microbes.
Parasitism is a symbiotic relationship between organisms in evolutionary ecology, where one organism, the parasite, survives on or in another organism, the host, causing some damage to it, and is structurally adapted to this way of life. Parasitism is a long-term biological relationship between a parasite and its host that is intimate and permanent.
Commensalism is a species relationship in which one profit and the other is unaffected. In their bodies, humans host a number of commensal bacteria that do not harm them but depend on them for survival (e.g. dead skin eating bacteria) .
Any link between two or more biological species is symbiosis. Usually, such partnerships are long-term and have a powerful effect on one or both species' fitness. Symbiotic relationships are defined by rewards and physical relationships.
Mutualism is a relationship that is normal in nature, where both organisms profit. There are several examples of mutualistic bacteria in the gut in microbiology that promote digestion in both humans and animals.

So, the correct answer is, ‘(c) Parasitism’.

Note: Parasites feed on living hosts, unlike saprotrophs, while some parasitic fungi, for example, may continue to feed on hosts they have destroyed. The parasitic relationship hurts the host, either feeding on it or, as in the case of intestinal parasites, eating some of its food, unlike commensalism and mutualism. They can readily serve as vectors of pathogens, causing disease, since parasites associate with other organisms.