The Sunlight-Nutrient Connection
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Questions and Answers

Which season do red tides typically occur in the northern hemisphere?

  • April through September (correct)
  • January through June
  • July through December
  • October through March
  • What is the main cause of ocean eutrophication?

  • Natural nutrient scarcity
  • Decrease in primary productivity
  • Artificial enrichment of nutrients (correct)
  • Decrease in harmful algal blooms
  • What is the primary reason for the formation of dead zones?

  • Decrease in algal blooms
  • Decrease in dissolved oxygen
  • Nutrient runoff from rivers (correct)
  • Increase in fish population
  • What happens to the dissolved oxygen concentration in the water during a dead zone?

    <p>It decreases</p> Signup and view all the answers

    Which of the following is the second largest dead zone in the world?

    <p>The Gulf of Mexico</p> Signup and view all the answers

    What is the main cause of the dead zone in the Gulf of Mexico?

    <p>Water runoff from the Mississippi River Basin</p> Signup and view all the answers

    Which marine plankton is the most abundant and smallest?

    <p>Four Clara Cook</p> Signup and view all the answers

    Which region has the greatest primary productivity in the summer and least in the winter?

    <p>Polar oceans</p> Signup and view all the answers

    Which months have the highest sunlight in the year?

    <p>June, July, and August</p> Signup and view all the answers

    What causes a phytoplankton bloom in the spring?

    <p>Increased sunlight and abundant nutrients</p> Signup and view all the answers

    When do zooplankton populations peak?

    <p>April</p> Signup and view all the answers

    Which ocean region has the highest year-round phytoplankton productivity?

    <p>Mid-latitude oceans</p> Signup and view all the answers

    Which ocean current brings nutrient-rich water towards the surface near Antarctica?

    <p>North Atlantic deep water</p> Signup and view all the answers

    What is the main reason for decreased productivity in the southern hemisphere?

    <p>UV radiation</p> Signup and view all the answers

    Why is the productivity in the open ocean in tropical areas fairly low?

    <p>Thermocline prevents vertical mixing</p> Signup and view all the answers

    When does the productivity in temperate oceans reach its peak?

    <p>Spring</p> Signup and view all the answers

    Which type of organisms in the ocean convert solar energy into chemical energy?

    <p>Producers</p> Signup and view all the answers

    What is the term used to describe the dead remains and waste products of organisms in the ocean?

    <p>Detritus</p> Signup and view all the answers

    Which feeding strategy involves taking in seawater and filtering out usable organic matter?

    <p>Filter feeding</p> Signup and view all the answers

    What is the primary source of biomass in marine ecosystems?

    <p>Producers</p> Signup and view all the answers

    Which organisms are considered herbivores in the food chain?

    <p>Cows</p> Signup and view all the answers

    What percentage of energy is transferred between each feeding stage?

    <p>10%</p> Signup and view all the answers

    What is the flow efficiency of energy conversion to the primary producers at trophic level number one?

    <p>2%</p> Signup and view all the answers

    Which organisms are considered top predators in the food chain?

    <p>Carnivores</p> Signup and view all the answers

    What is the relationship between biomass and trophic level in the biomass pyramid?

    <p>Biomass decreases with each trophic level</p> Signup and view all the answers

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