Fishes & Mollusks

21. The largest class of mollusks is:

    a) Gastropoda

    b) Cephalopoda

    c) Bivalvia

    d) Polyplacophora

22. Which of the following is a cephalopod mollusk?

    a) Snail

    b) Clam

    c) Squid

    d) Mussel

23. Mollusks are classified into how many main classes?

    a) 2

    b) 3

    c) 4

    d) 5

24. Sharks belong to which class of fish?

    a) Chondrichthyes

    b) Actinopterygii

    c) Myxini

    d) Sarcopterygii

25. What is the function of the gills in fishes?

    a) Respiration

    b) Digestion

    c) Excretion

    d) Reproduction