A) mutualism
B) protocooperation
C) parasitism
D) predadon
Correct Answer: A
Solution :
Zoochlorellae is an unicellular green alga, lives in gastrodermal cavity of Hydra and shows mutualism or symbiosis. The alga gives food and oxygen to Hydra and Hydra in turn gives shelter and nitrogenous substances to alga.
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