Quiz
Your essay answer should be clear and succinct, amounting to perhaps 3-5 sentences totaling 30 to 50 words; longer essays are strongly discouraged. It is recommended that you prepare your answer in a separate document from which you copy it into Canvas.
Question 1 5 pts
Explain the role of bacteria (decomposers) in the process of recycling organic matter derived from photosynthesis.
A strong answer will describe the fate of organic material produced by photosynthesis in the ocean water column and in sediments, with an emphasis on the processes of bacterial decomposition.
Question 24 pts
Marine organisms consist of an hierarchical system of trophic levels that describe the feeding relationships between them. Match each trophic level to the definitions and specific categories of organisms that characterize it.
First trophic level
[ Choose ]Tertiary consumers, typically large carnivores such as tuna or herringSecondary consumers, typically small carnivores such as anchovies and amphipodsPrimary producers, typically photosynthetic plants such as diatom and dinoflagellatesPrimary consumers, typically herbivores such as copepods and euphausids
Second trophic level
[ Choose ]Tertiary consumers, typically large carnivores such as tuna or herringSecondary consumers, typically small carnivores such as anchovies and amphipodsPrimary producers, typically photosynthetic plants such as diatom and dinoflagellatesPrimary consumers, typically herbivores such as copepods and euphausids
Third trophic level
[ Choose ]Tertiary consumers, typically large carnivores such as tuna or herringSecondary consumers, typically small carnivores such as anchovies and amphipodsPrimary producers, typically photosynthetic plants such as diatom and dinoflagellatesPrimary consumers, typically herbivores such as copepods and euphausids
Fourth trophic level
[ Choose ]Tertiary consumers, typically large carnivores such as tuna or herringSecondary consumers, typically small carnivores such as anchovies and amphipodsPrimary producers, typically photosynthetic plants such as diatom and dinoflagellatesPrimary consumers, typically herbivores such as copepods and euphausids
Question 3 1 pts
How much energy is typically transferred between successive trophic levels?

100%

50%

10%

1%

0.1%

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