Question

Occurrence of Zoochlorellae in the body wall of Hydra is an example of

• A. A predation
• B. A food chain involving a parasite
• C. Commensalism
• D. Mutualism

Answer 1

Answer: (D)

Mutualism

Zoochlorellae is a genus of green algae. This term is often used while referring to algae that live symbiotically with some invertebrate. Zoochlorellae are found in mutualistic relationships with invertebrates and utilize carbon dioxide, nitrogenous and phosphorous wastes and in turn, provides oxygen and other nutrients to the host.

So, the correct answer is 'Mutualism'.