10 Jun The planktonic algae that cause toxic blooms
Question
11. The planktonic algae that cause toxic blooms known as “red tides” belong to the:
a. Coccolithophorids
b. Diatoms
c. Dinoflagellates
d. Foraminifera
e. Radiolaria
12. The skeletons of the Hexactinellida are composed of:
a. Calcium carbonate
b. Calcium phosphate
c. Keratin
d. Silicon dioxide
e. Spongin
13. The sexually reproducing life stage of the jellyfish is called the:
a. Acritarch
b. Actinula
c. Medusa
d. Planula
e. Polyp
14. The invertebrates that move by means of comb lates consisting of thousands of fused cilia are
called the:
a. Cnidaria
b. Ctenophora
c. Hydrozoa
d. Polyzoa
e. Scyphozoa
15. The rasping tongue-like feeding appendage characteristic of the Mollusca is called the:
a. Avicularium
b. Dactylozooid
c. Gonozooid
d. Proboscis
e. Radula
16. This type of planktonic larval stage is unique to the Mollusca:
a. Actinula
b. Metatrochophore
c. Pilidium
d. Trochophore
e. Veliger
17. This group of planktonic snails plays an important role on carbon cycling in the open ocean:
a. Polyzoa
b. Ptermorphs
c. Pteropods
d. Pteropsida
e. Pterosaurs
18. This type of stinging cell is characteristic of the Cnidaria:
a. Cnidoblasts
b. Collocytes
c. Natural killer cells
d. Osteoclasts
e. Trichocysts
19. The skeletons of the Calcarea are composed of:
a. Calcium carbonate
b. Calcium phosphate
c. Keratin
d. Silicon dioxide
e. Spongin
20. This term describes an organism that adjusts is salinity to that of its external medium:
a. Endotherms
b. Homeotherms
c. Osmoconformers
d. Osmoregulators
e. Poikilotherms
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