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Unit 11 Ecosystems

Quiz by Amanda Wood

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41 questions
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  • Q1
    The figure shows two models of DNA. Compared to Model 1, Model 2 does a better job of showing –
    Question Image
    how a living cell depends on DNA
    the helical shape of a DNA molecule
    how atoms in DNA are arranged
    the sequence of base pairs in a DNA strand
  • Q2
    The table shows some observations made by four students during a field trip to a nature area. Which student made observations of a community of organisms?
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    Student 2
    Student 4
    Student 1
    Student 3
  • Q3
    Recent studies in bone research indicate that using ultrasound on a broken bone can decrease the healing time by 25%. Which of these are the most basic levels of organization involved when a bone heals?
    Cells and organ system
    Cells and tissue
    Tissue and organ system
    Organ system and organism
  • Q4
    A science class is planning a field trip to a local farm that has a large pond. Which of the following lists the order of biological organization from smallest to largest that the students can expect to find at the pond?
    Organism, community, population, ecosystem
    Population, organism, community, ecosystem
    Organism, population, community, ecosystem
    Population, organism, ecosystem, community
  • Q5
    A student sets up a compost bin outdoors. Inside the bin microorganisms convert the student’s vegetable and paper scraps into rich fertilizer.Which of the following best describes the role that these microorganisms play in natural habitats?
    The microorganisms help keep nutrients cycling through the ecosystem.
    The microorganisms help balance the numbers of producers and consumers.
    The microorganisms function as autotrophs.
    The microorganisms turn solar energy into sugars.
  • Q6
    Some fungi secrete substances that are toxic to bacteria that compete with them for food. Scientists have used their knowledge of this ability of fungi in order to produce which of the following substances?
  • Q7
    A student researching bacteria concluded a report with the claim in the box.Which statement correctly addresses the validity of the claim?
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    The claim is invalid because only microorganisms such as viruses disrupt the health of organisms.
    The claim is valid because bacteria cause disease.
    The claim is valid because many studies and experiments have shown that bacteria disrupt homeostasis.
    The claim is invalid because there are many types of bacteria that help organisms maintain homeostasis.
  • Q8
    An individual who participates in a long-distance run on a hot day will produce large quantities of sweat. As a result of the excessive sweating, the amount of urine produced by the kidneys will change.How will the kidneys respond to help the individual’s body maintain homeostasis?
    The kidneys will increase urine production so the body can absorb more nutrients.
    The kidneys will increase urine production to eliminate excess salt in the body.
    The kidneys will decrease urine production so the body can maintain blood pH.
    The kidneys will decrease urine production to allow the body to conserve water.
  • Q9
    The graph shows the basic changes in a forest community after a disturbance occurred.The information shown in the graph suggests that the changes in the forest community were caused by —
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    repeated habitat destruction
    decreased species diversity
    tree-leaf replacement after a storm
    succession after a fire
  • Q10
    Hydrothermal vents form deep in the ocean when iron-rich magma is released from openings on the seafloor. These vents spew extremely hot water (400°C) mixed with methane and sulfur. Bacteria that thrive in this hostile environment form the base of a food chain that leads to colonization by tube worms, mussels, and many other life-forms. When a hydrothermal vent becomes inactive and cold, the bacterial community that lives in the hot fluid methane and sulfur dies out. Which organisms most likely succeed the original community in this ecosystem?
    Giant kelp that use sulfur in photosynthesis
    Fish that do not need oxygen for cellular respiration
    Cold-tolerant bacteria that feed on sulfur and iron in the vents
    Ocean mammals that tolerate cold and act as top predators in the food chain
  • Q11
    The graph below shows the changes in the number of species in an ecosystem.Which event was most likely the cause of the changes in species diversity in this ecosystem?
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    A large volcanic eruption
    A flash flood
    A migration of locusts
    A small tornado
  • Q12
    As ecosystems move through the stages of succession, the populations of organisms in them change. Which of the following describes the stage of succession likely to have the most species diversity?
    An agricultural field that has not been plowed for one year
    A field that is regularly mowed
    A newly formed volcanic island
    A temperate forest that has never been cleared by logging
  • Q13
    How do an increase in the organic matter in soil and an increase in soil depth affect the population of plants in an area?
    Nitrogen-fixing bacteria kill young trees.
    Grasses become diseased.
    Mosses replace flowering plants.
    Larger plants become the dominant organisms.
  • Q14
    During ecological succession, how does the growth of young hardwoods affect the organisms living in an ecosystem?
    All of the above
    Grasses and low shrubs are unable to obtain the amount of light they need to survive, so there are small numbers of them.
    The trees provide shelter and food for a variety of mammals, insects, and birds.
    In autumn, falling leaves provide a source of energy for decomposers such as fungi.
  • Q15
    Which statement best describes the differences in species diversity between an ecosystem beginning the process of primary succession and one beginning the process of secondary succession?
    Species diversity is much greater in the ecosystem undergoing primary succession because that ecosystem is experiencing a longer period with a lack of competition for space.
    No differences in species diversity exist because both ecosystems initially lack living organisms.
    Species diversity is greater in the ecosystem undergoing secondary succession because the soil already contains seeds and spores of various species.
    Species diversity is much greater in the ecosystem undergoing primary succession because the lack of soil provides a greater area for organisms to claim niches.

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