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 Adaptations of intertidal organisms




1. The closest living relative of the cetaceans is the:

a. Beaver

b. Elephant

c. Hippopotamus

e. Sea otter

e. Walrus

2. The closest living relative of the sirenians is the:

a. Beaver

b. Elephant

c. Hippopotamus

e. Sea otter

e. Walrus

3. All of these are adaptations of intertidal organisms for coping with low temperatures


a. Antifreeze compounds

b. Compact body form

c. Dark coloration

d. Ridged shells

4. The symbiotic algae found living in coral reefs are called:

a. Coccolithophorids

b. Diatoms

c. Dinoflagellates

d. Phytoplankton

e. Zooxanthellae

5. Animals that can live in a broad range of salinities are called:

a. Eukaryotic

b. Euryhaline

c. Polymorphic

d. Stenohaline

6. These sense organs enable sharks to detect electrical fields:

a. Ampullae of Lorenzini

b. Apical organs

c. Lateral lines

d. Ocelli

e. Semicircular canals

7. The skeleton of hagfish, lampreys, and sharks is composed of:

a. Calcium phosphate

b. Cartilage

c. Hydrated polymerized silicic acid (opal)

d. Spongin

8. The type of life cycle in which an individual initially is a male and then turns into a female is


a. Heterospory

b. Protoandry

c. Protogyny

d. Simultaneous hermaphroditism

9. Vertebrates with a water-proof egg that can be laid on land are called:

a. Amniotes

b. Amphibians

c. Choanates

d. Sarcopterygians

e. Teleostomes

10. The zone of rapid increase in salinity is called the:

a. Halocline

b. Isocline

c. Pycnocline

d. Thermocline

11. Organisms that adjust the salinity of their body fluids to that of the external medium are


a. Ectotherms

b. Endotherms

c. Homeotherms

d. Osmoconformers

e. Osmoregulators

12. Openings in the roots of mangroves to allow gas exchange are called:

a. Blastopores

b. Pneumatophores

c. Spiracles

d. Stomata

13. The muscles of diving mammals have abundant quantities of this molecule which stores] oxygen for deep dives:

a. Chlorocruorin

b. Hemeryhtrin

c. Myoglobin

d. Myosin

e. Tropomysoin

14. Estuaries carved by glaciers are called:

a. Bar-built estuaries

b. Coastal plain estuaries

c. Fjords

d. Tectonic estuaries

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