Marine_Biology_Exam_3_Version_A - 1 Marine Biology NAME A...

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Marine Biology NAME_____________________ A Fall 2009- Exam 3 Please put your last and first name on both this exam and on your scantron. In the upper right hand corner of your scantron put a large A to indicate you took version A of the exam. Test No. is Exam 3 1. The most primitive animals in the sea are a. starfish b. crustacean c. jellyfish d. sponges 2. Suspension Feeders a. feed on particulate organic matter that settles to the bottom b. get most of their energy from symbionts c. feed on particulate organic matter suspended in the water d. are autotrophs 3. Cnidarians a. include sea anemonies, jellyfish, and corals b. are radially symmetrical c. have a centrally located mouth surrounded by tentacles d. all of the above 4. In the marine benthos a. usually there are fewer animals/ area as you go deeper b. usually there are more animals/ area as you go deeper c. animal concentration is relatively uniform in shallow and very deep water d. none of these 5. Some deep ocean sediments are red clay. This sedimentary material originated a. from Foraminifera b. from Pteropods c. from diatoms d. from dust blowing off deserts 6. The thin layer of tissue which secretes the shell of a mollusk is known as a. a mantle b. a radula c. a foot d. a bivalve 7. An octopus is a. a Mollusc 1
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a Cnidarian c. a Coelenterate d. an Arthropod 8. The diversity of benthic species is highest at intermediate (2000-3000 meters). Why? a. because at those depths there is a very stable environment plus sufficient food falls from the surface b. because as you go deeper, water pressure becomes to great for most benthos c. because it is too as you go cold deeper d. because of intermediate disturbances from “benthic storms” and this allows more species to co-exist 9. How can a sessile (attached) organism spread and colonize new areas of the benthos? a. they have a planktonic larval stage b. predators that eat them transport them to new areas c. they bud off new individuals and the colonies spread out d. nobody knows 10. Reef building corals can only live a. where water temperature is higher than 18 – 20 degrees C b. where the water is lower than 18-20 C c. in upwelling areas d. where water is highly turbid 11. The Zooxanthellae which live symbiotically in the fleshy tissues of coral polyps are a. Diatoms b. Cyanobacteria c. Coccolithophores d. dinoflagellates 12. An estuary a. has seawater which is diluted with freshwater b. has higher salinity water than the ocean c. is not semi-enclosed d. none of the above 13. In an estuary, where is the water of highest salinity? a. far upstream near the bottom b. near the surface c. near the bottom closed to the ocean d. far upstream near the surface 14. What usually limits the productivity of phytoplankton in an estuary? a.
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This note was uploaded on 11/07/2011 for the course BIO 160 taught by Professor Dr.jonstern during the Fall '08 term at S.F. State.

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Marine_Biology_Exam_3_Version_A - 1 Marine Biology NAME A...

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