Chapter 7 Online Study Guide

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  • 1/10 Questions

    Polyps slowly build reefs by secreting a protective crust of _______________

    • Shale
    • Granite
    • Limestone
    • Pumice
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You should have read the chapter before you begin the study guide! Do not give or receive answers!

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  • 2. 

    On page 155 the books talks about the euphotic zone and dissolved oxygen.  Here is another example of how what we are doing in the eco column lab related to the real world and environmental science! May aquatic organisms, especially fish, die when dissolved oxygen levels fall below ___ parts per million

    • 10

    • 25

    • 5

    • 18

    Correct Answer
    A. 5
    Explanation
    The correct answer is 5 because when dissolved oxygen levels fall below 5 parts per million, many aquatic organisms, especially fish, may die. This is mentioned on page 155 of the book where it talks about the euphotic zone and dissolved oxygen. This example highlights the relevance of the eco column lab to real-world environmental science, as it demonstrates the potential consequences of low dissolved oxygen levels on aquatic organisms.

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  • 3. 

    Look at Figure 7-5. The ocean can be organized as a function of light penetration. There is the top layer that has enough light for photosynthesis, the middle layer that has light - but not enough for photosynthesis, and then the dark zone where no light penetrates. What is this deepest zone called?

    • Euphotic

    • Abyssal

    • Bathyal

    • Profundal

    Correct Answer
    A. Abyssal
    Explanation
    The deepest zone in the ocean where no light penetrates is called the abyssal zone. This zone is characterized by extremely high pressure and low temperatures, and it is home to a variety of deep-sea organisms that have adapted to survive in this harsh environment. The abyssal zone is located below the bathyal zone, which has some light but not enough for photosynthesis.

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  • 4. 

    Approximately what percentage of the wold's coral reefs are threatend by human activities such as coastal development, overfishing, pollution and warmer ocean temperatures?

    • 40%

    • 50%

    • 60%

    • 70%

    • 80%

    Correct Answer
    A. 60%
    Explanation
    Approximately 60% of the world's coral reefs are threatened by human activities such as coastal development, overfishing, pollution, and warmer ocean temperatures. This means that a majority of coral reefs are at risk due to various human-induced factors, which can have detrimental effects on their health and survival. These threats can lead to coral bleaching, habitat destruction, and loss of biodiversity, ultimately impacting the entire ecosystem dependent on coral reefs. Efforts to reduce these threats and protect coral reefs are crucial for their conservation and the preservation of marine biodiversity.

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  • 5. 

    Which of the following is an upper layer of warm water with high levels of dissolved oxygen?  make sure you know these vocabulary words.

    • Epilimnion

    • Thermocline

    • Hypolimnion

    • Bathyal

    Correct Answer
    A. Epilimnion
    Explanation
    The epilimnion is the upper layer of warm water in a lake or reservoir. It is characterized by high levels of dissolved oxygen due to its proximity to the surface and exposure to atmospheric oxygen. This layer is important for supporting aquatic life as it provides suitable conditions for aerobic organisms.

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  • 6. 

    Which of the following includes free-floating, microscopic cyanobacteria and many tpes of algae that are the producers supporting most aquatic food chains and webs?

    • Phytoplankton

    • Zooplankton

    • Nanoplankton

    • Plankton

    • Nekton

    Correct Answer
    A. Phytoplankton
    Explanation
    Phytoplankton includes free-floating, microscopic cyanobacteria and many types of algae that are the producers supporting most aquatic food chains and webs. They are responsible for the primary production in aquatic ecosystems, converting sunlight into energy through photosynthesis. Phytoplankton serve as a vital food source for zooplankton and other organisms higher up in the food chain. They also play a crucial role in the global carbon cycle, as they absorb carbon dioxide from the atmosphere and release oxygen.

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  • 7. 

    Just like the ocean, freshwater lakes can be divided into sections based on light penetration. Which zone allows for photosynthesis?

    • Profundal

    • Benthic

    • Limnetic

    • Littoral

    Correct Answer
    A. Limnetic
    Explanation
    The limnetic zone is the correct answer because it is the zone in a freshwater lake where light can penetrate and reach the surface. This allows for photosynthesis to occur, as plants and algae in this zone can use sunlight to produce energy. The profundal, benthic, and littoral zones are not suitable for photosynthesis as they either receive little to no light or are too shallow for plants to grow.

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  • 8. 

    Which of the following would best describe a turtle?

    • Phytoplankton

    • Zooplankton

    • Nanoplankton

    • Plankton

    • Nekton

    Correct Answer
    A. Nekton
    Explanation
    A turtle is best described as nekton because it is an active swimmer and can move independently in the water. Nekton refers to organisms that have the ability to swim against ocean currents and are not passively drifting like plankton. Phytoplankton, zooplankton, and nanoplankton are all types of plankton, which are organisms that drift in the water and cannot swim against currents. Therefore, nekton is the most appropriate term to describe a turtle.

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  • 9. 

    Look at Figure 7-3. At which of the following depths (meters) would you expect fo find the highest concentration of dissolved CO2?

    • 0 meters

    • 100 Meters

    • 200 meters

    • 500 meters

    • 1000 meters

    Correct Answer
    A. 1000 meters
    Explanation
    Based on Figure 7-3, the highest concentration of dissolved CO2 would be expected at 1000 meters.

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  • 10. 

    Write a paragraph explaining overturn in freshwater lakes in temperate biomes. This is critically important to lakes and ponds. Lake Worth, Benbrook Lake and all the lakes around Fort Worth undergo overturn. This should be at least 6 sentences

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