Holt Environmental Science Chapter 7
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  • Question 1
    30 seconds
    Q.

    Which of the following is not an environmental function of wetlands?

    answer choices

    increasing runoff

    absorbing and removing pollutants from water

    trapping carbon that would otherwise be released into the air

    controlling floods

  • Question 2
    30 seconds
    Q.

    Estuaries are very productive ecosystems because they receive fresh nutrients from

    answer choices

    lakes and ponds

    rivers and oceans

    marshes and swamps

    streams and springs

  • Question 3
    30 seconds
    Q.

    What causes most coastal pollution in the United States?

    answer choices

    overfishing

    temperature changes

    industrial waste and sewage

    lakes and ponds

  • Question 4
    30 seconds
    Q.

    Swamps are commonly found on

    answer choices

    rocky hillsides

    flat, poorly drained land

    forest clearings

    bottoms of ponds or lakes

  • Question 5
    30 seconds
    Q.

    The majority of marine organisms are found in

    answer choices

    deep ocean waters

    shallow, coastal waters

    fisheries

    none of the above

  • Question 6
    30 seconds
    Q.

    As they flow down a mountain to flatter ground, rivers generally become

    answer choices

    wider

    warmer

    slower

    all of the above

  • Question 7
    30 seconds
    Q.

    Which of the following statements is not correct?

    answer choices

    Lakes may contain a region that receives little sunlight.

    Wetlands help remove pollutants from water.

    Swamps are dominated by woody shrubs and water-loving trees.

    Rivers generally move faster, and their oxygen levels decrease, as they near the ocean.

  • Question 8
    30 seconds
    Q.

    Threats to ocean ecosystems are

    answer choices

    nutrient runoff and industrial waste discharges.

    overfishing and entanglement of marine mammals in trawl nets.

    sewage and algal blooms.

    All of the above

  • Question 9
    30 seconds
    Q.

    The types of organisms found in a pond or lake depend on

    answer choices

    the amount of sunlight available

    the temperature of the water

    the presence of nutrients

    All of the above

  • Question 10
    30 seconds
    Q.

    In the _____ zone, life is diverse and abundant.

    answer choices

    benthic

    eutrophic

    littoral

    plankton

  • Question 11
    30 seconds
    Q.

    In the _____ zone, the water is cool and dark.

    answer choices

    benthic

    eutrophic

    littoral

    plankton

  • Question 12
    30 seconds
    Q.

    What mainly distinguishes nekton from benthos?

    answer choices

    One lives in a freshwater ecosystem and the other lives in salty water

    One swims freely and the other often lives attached to a hard surface

    One is a predator and the other is a primary producer

    All of the above

  • Question 13
    30 seconds
    Q.

    Estuaries

    answer choices

    are always saltwater ecosystems

    are always freshwater ecosystems

    are ecosystems where both fresh water and salt water are present

    prevent the development of salt marshes

  • Question 14
    30 seconds
    Q.

    Which organism produces most of the food in an aquatic ecosystem?

    answer choices

    fish

    barnacles

    phytoplankton

    zooplankton

  • Question 15
    30 seconds
    Q.

    The arrangement of organisms in the open ocean is determined by the

    answer choices

    increase in salt content from shallow to deep waters

    size of the benthic zone, where photosynthesis occurs

    amount of nutrients and sunlight that are available

    distribution of zooplankton

  • Question 16
    30 seconds
    Q.

    Which of the following is not characteristic of wetlands?

    answer choices

    Wetlands have plentiful nutrients and the capacity for photosynthesis

    Wetlands are limited to inland freshwater environments

    Wetlands are perceived historically as disease-infested wastelands

    Wetlands have varied populations of plants and animals

  • Question 17
    30 seconds
    Q.

    An estuary functions as a mineral trap due to

    answer choices

    its great depth and particularly sticky sediment

    the mixing action of river water and ocean water

    its storing of pesticides from agricultural runoff

    the filtering action of bottom-feeding fish species

  • Question 18
    30 seconds
    Q.

    Coral reefs are intricately shaped rocklike structures that are formed as a result of

    answer choices

    volcanic activity that is common in tropical marine environments

    the gradual accumulation and fusion of skeletons of bony fish

    the secretion of calcium carbonate by tiny marine animals

    minerals that are washed from land ecosystems and build up

  • Question 19
    30 seconds
    Q.

    What are the two main types of freshwater wetlands?

    answer choices

    lakes and ponds

    rivers and streams

    littoral zones and benthic zones

    marshes and swamps

  • Question 20
    30 seconds
    Q.

    Which of the following is not characteristic of salt marshes and mangrove swamps?

    answer choices

    Both provide habitats for wildlife

    Both are dominated by marsh grasses

    Both are found along coastal areas

    Both are threatened by development

  • Question 21
    30 seconds
    Q.

    Which ecosystem has the highest level of salinity?

    answer choices

    salt marsh

    river

    pond

    swamp

  • Question 22
    30 seconds
    Q.

    Which of the following is a threat to coral reefs?

    answer choices

    oil spills

    sewage

    pesticides

    all of the above

  • Question 23
    30 seconds
    Q.

    Why doesn’t photosynthesis occur in deep ocean water?

    answer choices

    The water temperature is too cold

    There is no sunlight

    There are not enough nutrients

    The salinity level of the water is too high

  • Question 24
    30 seconds
    Q.

    Fish are a type of _____, or free-swimming, organisms.

    answer choices

    plankton

    nekton

    benthos

    littoral

  • Question 25
    30 seconds
    Q.

    Marshes are dominated by ________ plants while swamps contain mainly ________ plants.

    answer choices

    tall, short

    short, tall

    nonwoody, woody

    woody, nonwoody

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