Divemaster Final Exam A part 2 questions with verified detailed answers

Divemaster Final Exam A part 2 questions with verified || || || || || || || || ||




detailed answers ||




What is the ocean's major source of productivity and the base of the marine food chain?
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a. Krill
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b. Seagrass
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c. Coral
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d. Phytoplankton - ✔✔d. Phytoplankton
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True or False. Natural processes, such as earthquakes and storms, are much more of a severe
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threat to coral reefs and wetlands than human-induced threats, such as pollution. - ✔✔False.
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True or False. When an alien (invasive) species is introduced into an ecosystem, it may have no
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natural enemies, which allows it to quickly multiply and possibly overtake and kill off native
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species. - ✔✔True. || ||




A _______________ exists when relatively warm, low-density surface water is separated from
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cool, high-density deep water.
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a. freshwater layer
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b. thermocline
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c. downwelling
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,d. rip current - ✔✔d. thermocline
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If you stand on a beach and watch water generally moving down the coast, pushed by waves
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approaching the shore at an angle and assisted by the prevailing wind, you are looking at a
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_______ current. || ||




a. rip
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b. tidal
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c. longshore
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d. upwelling - ✔✔c. longshore
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A day after strong winds drive surface waters offshore, you notice that water conditions become
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clear and cool. This is likely due to:
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a. downwelling
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b. extreme tides.
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c. a longshore current.
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d. upwelling - ✔✔d. upweling
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Gravitational interaction between the sun, moon and earth cause ______, while wind is the most
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common disturbing force that causes ___________.
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, a. tides / waves
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b. surge / currents
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c. rip currents / ocean swells.
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d. waves / tides - ✔✔a. tides / waves.
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True or False. As a wave moves toward shore, its energy is affected by the bottom causing the
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wave height to rise, eventually becoming unstable and spilling its energy as surf. - ✔✔True.
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Ways that you can encourage divers to protect the underwater world include:
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a. be a role model for others divers, dive carefully and be aware of equipment placement when
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diving.


b. respect underwater cultural heritage and maritime history.
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c. report environmental disturbances or destruction and get involved in local environmental
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activities and issues. || ||




d. All of the above. - ✔✔d. All of the above.
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While outside, at a very cold temperature, you fill a balloon with air. What will happen when you
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take the balloon inside and place it near a heater?
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a. The density in the balloon will remain unchanged.
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