question_answer 27)

  Which one is a true fish? (a) Jellyfish                         (b) Starfish                          (c) Dogfish          (d) Silverfish

Answer:

  (c) Jellyfish or jellies are approximately cylindrical vase shaped individuals of phylum-Cnidaria. These are free swimming marine animals consisting of a gelatinous umbrella shaped bell (pulsate for locomotion) and tentacles (to capture prey). Starfish are star shaped echinoderms. These are marine invertebrates which have a central disc and five arms. (tube feet for locomotion) Scoliodon (dog fish) belongs to the class-Chondricythes i.e., pieces. These Senses are known as dog fish due to their, ability to smell. Lepismasacharina commonly known as silver fish is small wingless insect belongs to phylum-Arthropod.