Eutrophication: Too Much Life
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jtweaver
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20 QuestionsShow answers
  • Question 1
    30 seconds
    Q.

    Eutrophication is caused by

    answer choices

    excess nutrients building up in the water.

    industrial point-source pollution.

    unlined landfills and septic tanks.

    wastewater from homes mixing with drinking water.

  • Question 2
    30 seconds
    Q.

    As P and N build up, the probability of _______________ increases.

    answer choices

    lower BOD

    algal blooms

    oxygenation

    increased DO

  • Question 3
    45 seconds
    Q.

    How does eutrophication cause the death of aquatic organisms

    answer choices

    the build up of carbon dioxide in the water

    the lack of nitrogen in the water

    the lack of carbon dioxide in the water

    the lack of oxygen in the water

  • Question 4
    45 seconds
    Q.

    How can an algal bloom (eutrophication) lead to a decrease in dissolved oxygen? Select all that apply.

    answer choices

    Algae is a heterotroph and consumes more oxygen than it produces.

    Decreased light penetration limits photosynthesis below the surface.

    Bacteria consume oxygen as they decompose dead algae and other organisms.

    Decomposes that would have produced oxygen are outcompeted by algae.

  • Question 5
    60 seconds
    Q.

    The two critical nutrients in eutrophication are... (select two)

    answer choices

    nitrates

    phosphates

    carbon dioxide

    dissolved oxygen

  • Question 6
    60 seconds
    Q.

    In eutrophication, dissolved oxygen levels decrease because

    answer choices

    bacteria use it as they decompose organic material

    algae uses it during photosynthesis

    it reacts with hydrogen to form H2O (water)

    fish use it up as they consume algae

  • Question 7
    30 seconds
    Q.

    A new golf course is built next to a river. Over the past several months, the nitrate levels of the water in the river have been increasing. Which best explains the cause of the increasing nitrate levels?

    answer choices

    increased growth of algae

    decreased biodiversity

    runoff from fertilizer

    chemical reactions with pesticides and fertilizers

  • Question 8
    30 seconds
    Q.

    Which would most likely happen if too many nutrients entered an estuary?

    answer choices

    Nutrients would be used up by the fish and plants, keeping the estuary in balance.

    Algal blooms would lower dissolved oxygen levels, causing fish to suffocate.

    Algal blooms would decrease, leaving few food resources for fish.

    Nutrients would sink to the bottom, increasing soil deposition.

  • Question 9
    30 seconds
    Q.

    Which process would most likely increase the dissolved oxygen level in a freshwater lake?

    answer choices

    algae bloom

    lake turnover

    photosynthesis

    respiration

  • Question 10
    30 seconds
    Q.

    How do excess nutrients typically enter a body of water?

    answer choices

    rain water washes lawn and agricultural fertilizers into the ecosystem

    Scientists are adding fertilizer to the ecosystem

    Nitrogen fixing bacteria are creating an excess of organic nitrogen compounds

    algae are causing denitrification in the water

  • Question 11
    60 seconds
    Q.

    Where is the most likely location of a dead zone in this watershed?

    answer choices

    A

    B

    C

    I

    H

  • Question 12
    60 seconds
    Q.

    Why do nitrates and phosphates cause algal blooms?

    answer choices

    They are critical plant nutrients.

    They kill off competition.

    Because algae grow faster than decomposers.

    Nitrates and phosphates are density independent limiting factors.

  • Question 13
    300 seconds
    Q.

    The scientists measured hypoxia levels. What is hypoxia?

    answer choices

    a fish

    oxygen deficiency

    rainfall

    carbon dioxide deficiency

  • Question 14
    300 seconds
    Q.

    Hypoxia refers to a complete lack of DO (dissolved oxygen) whereas anoxis refers to low levels of DO that some organisms cannot survive.

    answer choices

    True

    False

  • Question 15
    30 seconds
    Q. Eutrophication is
    answer choices
    production of excessive organic matter
    the killing of fish
    the killing of plants
    farming in Eurpoe
  • Question 16
    30 seconds
    Q. Eutrophication causes
    answer choices
    production of excessive organic matter
    the killing of fish
    water to get healthier
    farming in Eurpoe
  • Question 17
    30 seconds
    Q. Eutrophication is caused by
    answer choices
    runoff of excessive fertilizer and nutrients
    cleaning up waterways
    using nuclear energy
    using solar energy
  • Question 18
    30 seconds
    Q. When excess nutrients make their way into the waterways,
    answer choices
    fish populations increase
    algal blooms increase
    frog population increases
    people get more vitamins in their water
  • Question 19
    30 seconds
    Q. Which term means "lack of oxygen?"
    answer choices
    asphyxia
    hypoxia
    eutrophication
  • Question 20
    30 seconds
    Q. An area where animals and plants have stopped thriving is known as a
    answer choices
    desert
    dead zone
    tundra
    taiga
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