Environmental Science: Soil and Pests Quiz
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Questions and Answers

What is the most common control method used for introduced species?

  • Cultural management
  • Mechanical control
  • Pesticide use (correct)
  • Biological control
  • Which of the following best describes freshwater ecosystems?

  • Always rich in nutrients
  • Includes moving and nearly stationary bodies of water (correct)
  • Consists of oceans and seas
  • Contains high salt concentration
  • What is a watershed?

  • A type of mechanical control
  • A control method for introduced species
  • An area of land draining into a single water body (correct)
  • A nutrient-poor water body
  • What type of ecosystem covers more than 70% of the Earth's surface?

    <p>Marine ecosystems (D)</p> Signup and view all the answers

    Which of the following is NOT considered a cultural service of ecosystems?

    <p>Hunting for food (C)</p> Signup and view all the answers

    What limits the size of a population in an ecosystem?

    <p>Limiting factors (B)</p> Signup and view all the answers

    How do abiotic factors influence ecosystems?

    <p>By influencing survival capabilities of species (A)</p> Signup and view all the answers

    What is one of the largest industries in Ontario as mentioned?

    <p>Forestry (A)</p> Signup and view all the answers

    What is bioamplification?

    <p>The concentration of toxins in organisms higher up the food chain. (A)</p> Signup and view all the answers

    What characterizes primary succession?

    <p>It occurs on bare rock or soil where no life existed. (D)</p> Signup and view all the answers

    Which trophic level does grass occupy in a food chain?

    <p>Trophic level 1 (C)</p> Signup and view all the answers

    What does species richness measure?

    <p>The variety of life forms in a given area. (D)</p> Signup and view all the answers

    What is a common consequence of habitat destruction on biodiversity?

    <p>Decline in species populations. (D)</p> Signup and view all the answers

    What is an invasive species?

    <p>A non-native species that negatively impacts local ecosystems. (A)</p> Signup and view all the answers

    Which of the following scenarios represents secondary succession?

    <p>A forest recovers after a fire has occurred. (B)</p> Signup and view all the answers

    What is the first action in response to species at special concern?

    <p>Monitoring and assessing the species. (D)</p> Signup and view all the answers

    What effect do synthetic fertilizers have on soil organisms?

    <p>They disrupt the natural balance of soil organisms. (A)</p> Signup and view all the answers

    What is a consequence of using pesticides in agriculture?

    <p>They can lead to bioaccumulation in the food chain. (B)</p> Signup and view all the answers

    What is the term for the process by which nutrients are removed from soil as water passes through it?

    <p>Leaching (C)</p> Signup and view all the answers

    Which type of pesticide is toxic to a limited number of species?

    <p>Narrow-spectrum pesticide (A)</p> Signup and view all the answers

    How does soil compaction affect plant roots?

    <p>It makes it difficult for roots to access oxygen. (D)</p> Signup and view all the answers

    What is a major risk of using broad-spectrum pesticides?

    <p>They may lead to pest resistance. (D)</p> Signup and view all the answers

    What type of water sources do farmers primarily rely on?

    <p>Surface sources and groundwater (A)</p> Signup and view all the answers

    What is the main reason weeds are considered pests?

    <p>They compete with and damage crop species. (D)</p> Signup and view all the answers

    Flashcards

    Leaching

    The process by which nutrients are removed from the soil as water passes through it, potentially leading to groundwater contamination.

    Pesticides

    Chemical substances that kill pests, including herbicides, insecticides, and fungicides.

    Bioaccumulation

    The buildup of toxins in an organism's body over time, as it consumes contaminated food.

    Biomagnification

    The increasing concentration of toxins in organisms at higher trophic levels in a food chain.

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    Monoculture

    The practice of planting only one type of crop over a large area.

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    Pests

    Organisms that compete with or damage crops.

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    Broad-spectrum pesticides

    Pesticides that are toxic to a wide range of species.

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    Narrow-spectrum pesticides

    Pesticides that are toxic to a limited number of species.

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    Equilibrium

    The state of an ecosystem where conditions remain relatively stable over time.

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    Succession

    The process of rebuilding an ecosystem after a disturbance.

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    Primary Succession

    A type of succession that occurs on bare land with no previous life, such as volcanic rock.

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    Secondary Succession

    A type of succession that occurs when life already exists, such as after a forest fire or pollution.

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    Biodiversity

    The variety of life found in an area.

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    Species Richness

    The number of species in an area.

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    Special Concern

    A species that may become threatened or endangered due to various factors.

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    Invasive Species

    A species introduced to a new environment where it lacks natural controls (predators or diseases) and may cause harm.

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    Biological Control

    The intentional introduction of organisms to control invasive species.

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    Mechanical Control

    Invasive species can be controlled by physical barriers or removal. This may include cutting down or burning plants, or hunting or trapping invasive animals.

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    Watersheds

    Areas of land where water drains into a single river or lake.

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    Limiting Factor

    Any factor that restricts the size of a population.

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    Ecosystem Services

    These ecosystems provide services to humans and the biosphere. These services include cultural services, ecosystem products, and other vital functions.

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    Cultural Services

    These services refer to the recreational, aesthetic, and spiritual experiences we gain from interacting with nature. Ecotourism is an example.

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    Ecosystem Products

    These are tangible goods we obtain from ecosystems, such as hunting, fishing, and forestry. They provide food, materials, and income.

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    Forestry

    This industry is a major contributor to Ontario's economy, producing billions of dollars annually.

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    Study Notes

    Managing the Soil

    • Soil is a complex, critical component of ecosystems.
    • Fertilizers (natural or synthetic) add nutrients to soil, but synthetic use can harm organisms and water supply.
    • Natural fertilizers are better for the environment when used correctly.
    • Nutrients from fertilizers can leach into groundwater, harming aquatic ecosystems.
    • Proper drainage systems are essential for soil health to aid root growth.
    • Soil compaction hinders root growth and oxygen absorption.

    Pests and Poisons

    • Pests are organisms that damage or compete with crops.
    • Monocultures (planting one type of crop) create ideal conditions for pests.
    • Pesticides are poisons used to kill pests, including herbicides to kill plants.
    • Some pesticides persist in the environment, affecting non-target species long term.
    • Some pests can develop resistance to pesticides.

    Bioamplification

    • Pesticides accumulate in organisms as they eat contaminated food.
    • This bioaccumulation affects organisms higher up in the food chain.
    • The concentration of toxins increases as organisms consume each other.
    • Top-level consumers are particularly vulnerable to higher levels of pesticides.
    • Organic farming practices can reduce pesticide use and contamination.

    Equilibrium and Change

    • Most natural ecosystems remain in a state of relative equilibrium, with reasonably stable conditions over time.
    • When ecosystems experience major disturbances they return to equilibrium through succession.
    • Primary succession occurs on bare rock where no life previously existed.
    • Secondary succession occurs where some life exists already, such as after a fire.

    Food Webs and Food Chains

    • Food webs and chains show the flow of energy through an ecosystem.
    • A food web is more complex than a food chain.
    • Food webs demonstrate the interconnectedness and biodiversity of organisms in the ecosystem.

    Biodiversity

    • Biodiversity is the variety of life in an area.
    • It's often measured by counting the number of species.
    • Biodiversity is higher closer to the equator.
    • Human activities (deforestation, agriculture) are threatening biodiversity and causing species extinction.
    • Many species are at risk due to environmental degradation.

    Non-native Species

    • Introducing non-native species can disrupt ecosystems.
    • Successfully introduced species may have no natural predators or disease to regulate their population growth.
    • Methods of controlling invasive non-native species include chemical, mechanical, and biological controls.

    Aquatic Ecosystems

    • Aquatic ecosystems are divided into freshwater (less than 1% salt) and marine (about 3% salt).
    • Freshwater examples include rivers and lakes.
    • Some wetlands, like bogs and marshes, have high nutrient concentrations.
    • Water sheds determine where water flows into oceans or lakes.
    • Most of the Earth's surface is covered with marine ecosystems.

    Ecosystem Services

    • Natural ecosystems provide multiple vital services to humans.
    • These include ecotourism, recreation, plant/animal harvest, and protection from some natural hazards (water erosion).

    Influences on Ecosystems

    • Various abiotic and biotic factors influence the size and distribution of populations.
    • Limiting factors restrict population sizes.
    • Abiotic factors like temperature, light, soil type affect species survival and distribution.
    • Tolerance ranges describe the optimum conditions for each species.

    Energy Flow

    • Radiant energy from the sun is the primary energy source for most ecosystems.
    • Photosynthesis converts light energy into chemical energy in plants (producers).
    • Chemical energy then flows through food chains and webs to consumers.
    • Some energy is lost at each stage of the food chain or web; thus, organic matter needs a constant energy input.

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    Description

    Test your knowledge on the role of soil in ecosystems and the impact of fertilizers. Explore the relationship between pests, pesticides, and bioamplification. Understand how agricultural practices affect our environment and the importance of sustainable methods.

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