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Is Matter Around Us Pure — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure1 Mark
MCQ
Which one is a true fish?
  • A
    Jellyfish.
  • B
    Starfish.
  • C
    Dogfish.
  • D
    Silverfish.
✓

Answer

  1. Dogfish.

Explanation:

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., pisces. These fishes are known as dog fish due to their, ability to smell. Lepismasacharina commonly known as silver fish is small wingless insect belongs to phylum- Arthropoda.

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