Question

Study the following statements about Adamsia and select your option
1) It is a parasite on clownfish
2) It is an example of commensalism along with down fish
3) It is called sea anemone
4) It is called hermit crab
A. 1 and 2 are correct
B. 2 and 3 are correct
C. 3 and 4 are correct
D. 1 and 4 are correct

Answer 1

Hint: Cnidaria is a phylum containing species of aquatic animals. It comprises mostly eleven thousand species of mostly marine animals. Jellyfish, medusa, sea anemones are few examples of animals belonging to the phylum Cnidaria.

Complete answer:
Adamsia is also known as a sea anemone. They are marine and most of them have a colorful appearance. Sea anemone is a single polyp connected to a tough surface by its base, however, some species reside in soft sediments and a couple of floats close to the surface of the water. The polyp encompasses a columnar trunk screw-topped by an oral disc with hoops of tentacles and a central mouth. The tentacles may be placed backward within the body cavity or expanded to catch the passing prey. They're armed with cnidocytes (stinging cells). In several species, further nourishment comes from a symbiotic relationship with one-celled dinoflagellates, zooxanthellae, or with algae, zoochlorellae that live inside the cells. Some species of sea anemone reside in association with hermit crabs, tiny fish, or different animals to their mutual profit. Adamsia shows a symbiotic relationship with clownfish during which the Adamsia gets its food with the assistance of clownfish, and the clownfish is being protected against its enemies because of the presence of stinging cells within the anemone. This sort of dependent relationship is termed commensalism.

Hence, option (B) is correct.

Note:
Sea anemones breed by releasing sperms and eggs through the mouth into the ocean. The ensuing fertile eggs transform into larvae that, when being planktonic for a short while, settle on the bottom of the seabed and develop directly into juvenile polyps. Sea anemones additionally breed asexually, by breaking in halves or that regenerate into polyps.