A) A food chain involving a parasite
B) predation
C) Commensalism
D) Mutualism
Correct Answer: D
Solution :
Zoochlorellae in the body wall of Hydra and cellulose digesting protozoan (Triconympha) in gut of termite are examples of a relationship between the two are called symbiosis or mutualism Hydra and termite serve as host while zoochlorella and protozoan work as symbionts. In mutualism both the partners are benefitted from one another and there is no harm to any of them.
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