Fishes & Mollusks

16. Fishes have a skeleton made of:

    a) Cartilage

    b) Bone

    c) Shell

    d) Scales

17. Which of the following is not a characteristic of mollusks?

    a) Soft body

    b) Presence of shell

    c) Radula for feeding

    d) Cold-blooded

18. The swim bladder in fishes helps in:

    a) Balancing the body

    b) Digestion

    c) Respiration

    d) Swimming

19. The largest class of fishes is:

    a) Chondrichthyes

    b) Actinopterygii

    c) Myxini

    d) Sarcopterygii

20. Fishes use what type of fertilization method?

    a) Internal fertilization

    b) External fertilization

    c) Asexual reproduction

    d) None of the above