Intimate relation or association between two organisms is called:

osmosis
sexual relationship
mutualism
symbiosis
symbiosis  

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Host that accommodate sexual stages of parasite is called:
A. primary host
B. intermediate host
C. definitive host
D. secondary host
In symbiotic association of two organisms, one is benefited while other is neither benefited nor harmed, a biological phenomenon is known as:
A. commensalism
B. parasitism
C. mutualism
D. parasitism
In a parasitic relation, organism on which another organism depends on, called:
A. host
B. parent
C. dividing organism
D. feeder
A symbiotic relationship in which both organisms are equally benefited is called:
A. commensalism
B. mutualism
C. parasitism
D. symbiosis
A non-mutual relationship in which one species is getting benefit at expense of other is called:
A. symbiosis
B. mutualism
C. parasitism
D. lichens

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