Ecology: Ecosystems and Ecological Organization
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Questions and Answers

In an ecosystem, which of the following processes primarily contributes to the conversion of inorganic compounds into organic matter?

  • Decomposition by bacteria and fungi
  • Respiration by consumers
  • Photosynthesis by producers (correct)
  • Aerobic respiration
  • What role do decomposers play in an ecosystem's nutrient cycle?

  • Release oxygen into the atmosphere through photosynthesis.
  • Recycle organic material into inorganic nutrients that producers can use. (correct)
  • Consume primary producers to regulate their population.
  • Convert solar energy into chemical energy.
  • Considering the flow of energy in an ecosystem, what is the primary distinction between autotrophs and heterotrophs?

  • Autotrophs respire aerobically, while heterotrophs respire anaerobically.
  • Autotrophs capture energy from non-living sources, while heterotrophs obtain energy by consuming other organisms. (correct)
  • Autotrophs decompose organic material, while heterotrophs synthesize complex molecules.
  • Autotrophs consume other organisms, while heterotrophs produce their own food.
  • How does chemosynthesis differ from photosynthesis in terms of energy source?

    <p>Chemosynthesis uses geothermal energy, while photosynthesis uses solar energy. (C)</p> Signup and view all the answers

    Which of the following statements accurately describes the relationship between producers, consumers, and decomposers in an ecosystem?

    <p>Producers are the first trophic level that convert CO2 into food, the higher trophic levels consume this food, and decomposers recycle nutrients from dead organisms back to the soil for the producers. (C)</p> Signup and view all the answers

    Which step of the hypothetico-deductive method involves conducting repeated trials to ensure reliability and validity?

    <p>Experimentation/Data gathering (D)</p> Signup and view all the answers

    An ecologist is studying how a group of deer interact with each other and their environment. Which level of ecological organization is the ecologist primarily focused on?

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

    Which of the following best describes the relationship between a community and an ecosystem?

    <p>A community consists of interacting populations within an ecosystem. (D)</p> Signup and view all the answers

    Considering the levels of organization of matter, which sequence represents a progression from simpler to more complex?

    <p>Cells → Tissues → Organs → Organ Systems (D)</p> Signup and view all the answers

    A scientist observes that a certain species of fish only reproduces asexually. What can be inferred about this species based on this information?

    <p>The species produces offspring that are genetically identical to the parent. (B)</p> Signup and view all the answers

    Which of the following scenarios best illustrates the ecological principle of interdependence?

    <p>The cyclical relationship between predator and prey populations in an ecosystem. (C)</p> Signup and view all the answers

    How might the concept of 'finiteness of resources' directly influence the carrying capacity of a population within an ecosystem?

    <p>It establishes an upper limit on population size due to limited availability of essential resources. (D)</p> Signup and view all the answers

    How does autecology differ from synecology?

    <p>Autecology studies individual organisms; synecology studies groups of organisms. (B)</p> Signup and view all the answers

    A scientist observes that a specific plant species thrives only in soils with a pH between 6.0 and 7.5. This range represents the plant's:

    <p>Tolerance Limits (D)</p> Signup and view all the answers

    If a researcher is investigating how different species of plants compete for sunlight in a forest, which field of ecology is this research most aligned with?

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

    A scientist is studying how the color of a moth's wings affects its survival rate in different environments. They are specifically interested in how natural selection pressures lead to changes in the moth population over time. Which field of ecology does this scenario align with?

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

    In which of the soil horizons would you expect to find the highest concentration of organic material?

    <p>Horizon O (B)</p> Signup and view all the answers

    A new housing development clears a large area of forest. According to ecological principles, what is the most likely long-term consequence regarding the 'balance of nature'?

    <p>The ecosystem will undergo significant changes, potentially leading to reduced biodiversity and altered ecological functions. (D)</p> Signup and view all the answers

    Which of the following scenarios best illustrates the impact of 'time' as an abiotic factor on an ecosystem?

    <p>A population of birds with a long reproductive cycle struggling to find mates due to habitat fragmentation and decreased population density. (D)</p> Signup and view all the answers

    How does wind, as an abiotic factor, MOST directly influence the rate of transpiration in plants and evaporation in animals?

    <p>By removing moisture from the surface of plants and animals, maintaining a concentration gradient. (B)</p> Signup and view all the answers

    Which of the following scenarios exemplifies the principle that 'everything goes someplace' in an ecosystem?

    <p>Nutrients from decaying leaves are absorbed by the soil and used by plants. (A)</p> Signup and view all the answers

    Which of the following is MOST likely to be a limiting factor for primary productivity in a deep freshwater lake?

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

    A severe drought drastically reduces the water availability in both a terrestrial forest and a nearby freshwater ecosystem. Which of the following correctly identifies the primary limiting factors impacted in each ecosystem due to the drought?

    <p>Terrestrial: Precipitation; Aquatic: Water currents (B)</p> Signup and view all the answers

    Which of the following best describes the role of decomposers in an ecosystem?

    <p>They break down non-living material, enhancing topsoil and recycling nutrients. (C)</p> Signup and view all the answers

    What is the primary distinction between detritivores and decomposers in their ecological roles?

    <p>Detritivores consume non-living organic matter, while decomposers break down leaf litter and other non-living material. (A)</p> Signup and view all the answers

    How might a significant change in ambient temperature affect the rate of decomposition in an ecosystem?

    <p>Decomposition rates increase up to the optimum temperature for the decomposers involved, after which they may decline. (A)</p> Signup and view all the answers

    An organism functions best at its optimum temperature. If the environmental temperature fluctuates far beyond this optimum, what is the least likely consequence for the organism?

    <p>Increased efficiency in all internal biological processes. (D)</p> Signup and view all the answers

    How do poikilotherms primarily regulate their body temperature?

    <p>By behavioral and physiological adjustments to the external environment. (B)</p> Signup and view all the answers

    A lizard is observed moving between sunny and shady spots throughout the day. This behavior is most likely a strategy for:

    <p>Regulating its internal body temperature as a poikilotherm. (D)</p> Signup and view all the answers

    Consider an animal species that can maintain a stable internal body temperature across a wide range of environmental conditions. Which of the following is the most likely characteristic of this species?

    <p>It is a homeotherm with efficient internal temperature regulation mechanisms. (C)</p> Signup and view all the answers

    How does the process described by the overall reaction $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$ relate to the role of detritivores and decomposers in an ecosystem?

    <p>Detritivores facilitate the initial breakdown of organic matter, making it accessible for this reaction. (C)</p> Signup and view all the answers

    Which of the following explains how plants in cold environments avoid frostbite?

    <p>By using insulation strategies like hairs or thick barks. (D)</p> Signup and view all the answers

    How do camels adapt to arid conditions to conserve water?

    <p>By becoming nocturnal to avoid the heat of the day, tolerating dehydration, and tolerating elevated body temperatures. (C)</p> Signup and view all the answers

    What is the most significant role of light as an abiotic component in an ecosystem?

    <p>Providing the primary energy source for photosynthesis. (B)</p> Signup and view all the answers

    How does the depletion of the ozone layer primarily affect living organisms?

    <p>It increases the amount of UV radiation reaching the Earth's surface, causing damage to organisms. (B)</p> Signup and view all the answers

    Which characteristic of soil is most affected by the amount of rainfall and the slope of the land?

    <p>Soil moisture (D)</p> Signup and view all the answers

    How does 'soil structure' contribute to plant growth?

    <p>By providing the proper arrangement of soil particles creating good drainage of water &amp; gases. (C)</p> Signup and view all the answers

    What role do chlorofluorocarbons (CFCs) and nitrogen oxides (NO) play in the environment?

    <p>They deplete the ozone layer, reducing its ability to shield the Earth from harmful solar radiation. (A)</p> Signup and view all the answers

    What is 'physiological drought' in the context of plants in cold environments?

    <p>It is a condition where plants cannot absorb water because the roots become less permeable due to very low temperatures. (B)</p> Signup and view all the answers

    Flashcards

    Behavioral Ecology

    The study of the role of imprinting and instinct in social interactions among animals.

    Law of Interdependence

    Everything in nature is connected and affects everything else.

    Ernst Haeckel

    Coined the term 'Ecology' from the Greek word 'oikos' in 1869.

    Abiotic Components

    Non-living physical and chemical elements in the environment, like temperature and water.

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    Natural Selection

    The process where organisms better adapted to their environment tend to survive and reproduce.

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    Electron Transport

    A process in mitochondria converting glucose and oxygen to carbon dioxide and water.

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    Detritivores

    Organisms that consume nonliving organic matter and recycle nutrients.

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    Decomposers

    Organisms, like fungi and bacteria, that break down dead material and recycle nutrients.

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    Homeotherms

    Warm-blooded animals that maintain a constant body temperature, like birds and mammals.

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    Poikilotherms

    Cold-blooded animals that control body temperature through environmental means, like reptiles.

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    Heterotherms

    Animals that can be either warm-blooded or cold-blooded based on conditions.

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    Optimum Temperature

    The temperature range where organisms function best.

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    Producers

    Organisms that capture solar energy for photosynthesis, producing food.

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    Autotrophs

    Organisms that produce their own food from light or chemical energy.

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    Photosynthesis

    Process by which producers convert light energy into chemical energy, producing glucose and oxygen.

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    Consumers

    Organisms that cannot produce their own food and rely on consuming producers or other consumers.

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    Scientific Method

    A systematic process to investigate phenomena, develop hypotheses, and test them.

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    Hypothetico-Deductive Method

    A framework for scientific investigation that involves proposing and testing hypotheses.

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    Levels of Organization of Matter

    Hierarchical structure from subatomic particles to the universe, showing how matter is organized.

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    Ecology

    The study of interactions between organisms and their environment, both biotic and abiotic.

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    Autecology

    The study of individual organisms, their life histories, and adaptations to the environment.

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    Synecology

    The study of groups of organisms interacting within a community.

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    Population Ecology

    The study of population dynamics, growth, and fluctuations.

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    Chemical Ecology

    The study of chemical interactions in ecology, such as animal signals and defense mechanisms.

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    Soil Horizon O

    The top layer of soil, rich in organic material like decomposed leaves and plants.

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    Soil Horizon A

    The layer of soil below Horizon O, where minerals and organic matter mix, known as topsoil.

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    Wind's Role in Ecosystems

    Wind aids in pollination, seed dispersal, and affects transpiration in plants.

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    Time in Ecosystems

    Time influences processes like food gathering, reproduction, and locomotion in organisms.

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    Limiting Factors in Terrestrial Ecosystems

    Factors like sunlight, temperature, and soil nutrients that restrict organism growth on land.

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    Frostbite

    Damage to plants caused by ice crystals forming between cells.

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    Physiological Drought

    Condition where plant roots become less permeable to water due to low temperatures.

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    Xerophytes

    Plants adapted to arid conditions with succulent tissues for water storage.

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    Hydrophytes

    Plants that grow submerged or floating in water, possessing air spaces.

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    Halophytes

    Plants that thrive in marine environments and have succulent bodies.

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    Shade Tolerance

    Ability of plants to survive and grow in low light conditions.

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    Photoperiodism

    Reactions of organisms to changes in day length, affecting their growth and behavior.

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    Soil Texture

    Classification of soil based on the size of its particles (clay, sand, silt, loam).

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    Study Notes

    Introduction to Ecology: Ecosystems Components

    • All things originate from the earth and return to it—Menander

    What is Science?

    • Science is the process of gaining knowledge and investigating by making observations, posing questions, and testing through experimentation.

    Scientific Method

    • Hypothetico-deductive method
    • Steps:
      • Observation (direct or indirect)
      • Problem definition (within the domain of science; not a "Why?" question)
      • Hypothesis formulation (temporary explanation)
      • Experimentation/data gathering (a series of experiments)
      • Theory formulation (not speculation)

    Ecology and Levels of Organization of Matter

    • Ecology (from Greek oikos, meaning home) is the study of how organisms interact with one another and their non-living environment (biotic and abiotic components).
    • Studies natural connections in air, water, and soil.
    • Matter organization:
      • Subatomic particles → Atoms → Molecules → Protoplasm → Cells → Tissues → Organs → Organ Systems → Organisms → Populations → Communities → Ecosystems → Biosphere → Planet (Earth) → Solar System → Galaxy → Universe

    Ecosystem Organization

    • Organism: Composed of cells.
      • Eukaryotic vs. Prokaryotic
    • Species: Groups of organisms similar in appearance, behavior, and genetics.
      • Sexual vs. Asexual reproduction
      • 1.5 million named species; likely 10-14 million more.
    • Populations: Groups of individuals of the same species.
    • Communities: Groups of different populations.
    • Ecosystems: Communities of organisms and their environment.
    • Biosphere: All ecosystems on Earth.

    Subdivisions of Ecology

    • Autecology: Study of individual organism life histories and behaviors adapting to environmental conditions.
    • Synecology: Study of groups of organisms interacting as a unit.

    Fields of Ecology

    • Population Ecology: Study of population growth and fluctuations.
    • Chemical Ecology: Study of chemical use in animal recognition, trail-making, courtship, and defense.
    • Physiological Ecology: Study of individual organism responses to temperature, moisture, light, and environmental factors.
    • Evolutionary Ecology: Study of natural selection and evolution of populations.
    • Behavioral Ecology: Study of imprinting and instinct's role in animal social lives.

    Scientists Who Made Contributions in Ecology

    • Theophrastus (300BC): Studied the relationship between organisms and the environment; considered the father of botany.
    • Ernst Haeckel: Father of ecology; coined the term ecology from Greek roots.
    • Thomas Malthus (1766-1834): Studied populations.
    • Charles Darwin (1809-1882): Developed the theory of natural selection.

    Laws of Ecology

      1. Law: Nature knows best; Principle: Balance of nature.
      1. Law: All forms of life are important; Principle: Diversity and Stability.
      1. Law: Everything changes; Principle: Change.
      1. Law: Everything is connected to everything else; Principle: Interdependence.
      1. Law: Everything goes somewhere; Principle: Pollution and Accumulation.
      1. Law: Our's a finite resources; Principle: Finiteness of resources.
      1. Law: There is no such thing as a free lunch; Principle: Energy.
      1. Law: Nature is beautiful, and we are the stewards of God's creation; Principle: Stewardship

    Major Ecosystem Components

    • Abiotic components:
      • Temperature, water, moisture, light, soil, wind, precipitation, salinity, and time.
      • Tolerance limits for populations, limiting factors affecting population abundance.
    • Biotic components:
      • Producers (plants),
      • Consumers (animals),
      • Decomposers (bacteria, fungi).
      • Biotic interactions (predation, competition, symbiosis, parasitism, commensalism).

    Biotic Components of Ecosystems

    • Producers (autotrophs): Source of all food; photosynthesis.
    • Consumers (heterotrophs):
      • Aerobic respiration, Anaerobic respiration (methane, H₂S).
    • Decomposers (matter recyclers): Release organic compounds into soil and water used by producers.

    Producers: the First Trophic Level

    • Autotrophs ("self-feeders"): Capture solar energy for photosynthesis producing sugars.
      • Green plants, cyanobacteria, algae.
    • Chemosynthetic bacteria: Use geothermal energy in hot springs or deep-sea vents to produce food.

    Photosynthesis: Function of Producers

    • Light reaction: Uses light to produce ATP and NADPH; releases oxygen, happens in grana.
    • Dark reactions (Calvin cycle): Uses ATP and NADPH plus CO₂ to produce sugar, happens in stroma.

    Overall Reaction of Photosynthesis

    • 6CO₂ + 12H₂O + light energy → C₆H₁₂O₆ + 6O₂ + 6H₂O

    Consumers

    • Primary consumers (second trophic level): Herbivores (deer, grasshoppers) that consume plants.
    • Secondary Consumers (third trophic level): Carnivores that prey on primary consumers (wolves, rodents).
    • Tertiary Consumers (fourth trophic level): Predators at the highest trophic level; consume secondary consumers (hawks, owls).
    • Omnivores: Consume both plants and animals.

    Cellular Respiration Overview

    • Transformation of chemical energy (organic compounds) in food into usable chemical energy (ATP) for cells.
    • Occurs in plants and animals; steps include glycolysis, Krebs cycle, and electron transport.

    Detritivores and Decomposers

    • Detritivores: Consume non-living organic matter (scavengers of waste or dead bodies); example: millipedes.
    • Decomposers: Break down leaf litter and non-living materials; Enhance topsoil and recycle nutrients; example: fungi, bacteria.

    Abiotic Components: Temperature

    • Affects living things in two ways: (1) affects internal processes; (2) affects behavior in ecosystems.
    • Living things function optimally within specific temperature ranges.
      • Minimum temperature: Lower limit, where organisms can still function.
      • Maximum temperature: Highest limit, where organisms can still function.
      • Optimum temperature: Ideal temperature, where organisms function best.
      • Tolerance limits for populations.

    Abiotic Components: Water

    • Plants and animals maintain a favorable water balance.
    • Plant adaptations:
      • Xerophytes (arid conditions): Succulent tissue.
      • Hydrophytes (aquatic): Floating/submerged, air spaces.
      • Halophytes (marine): Succulent tissue.

    Abiotic Components: Light

    • Main source of energy in ecosystems.
    • Important for photosynthesis and the formation of vitamin D in animals.
      • Shade tolerance: Ability of plants to survive & grow in shade.
      • Photoperiodism: Reactions to changes in day length.
      • Ozone: Protects Earth from excessive solar radiation, ozone depletion: Caused by CFCs & NO.

    Abiotic Components: Soil

    • Formed by mechanical or chemical weathering of rocks plus addition of humus.
    • Soil texture: Clay (fine particles), sand (coarse particles), silt (medium), loam (mixture).
    • Soil moisture (water content): Affected by texture, rainfall, slope, and underlying rock types.
    • Soil acidity: Affected by the presence of lime or granite.
    • Soil structure: arrangement of soil particles, creating peds (larger structures) for water and gas drainage.
    • Soil color: iron affects color (reddish/brownish or gray).
    • Soil profile: Layers (horizons) differ in composition; example: O, A, B, C, R horizons.

    Abiotic Components: Wind or Air

    • Wind is an agent for pollination and seed dispersal.
    • Transpiration in plants and evaporation in animals occur faster in the presence of wind.
    • Strong winds can damage ecosystems.

    Abiotic Components: Time

    • Ecosystems are dynamic and affected by time.
    • Factors influenced by time include food-hunting-gathering abilities (affecting predator-prey relationships) and reproductive cycles & mate-finding in organisms. - Important for organisms' movements and locomotion based on time.

    Limiting Factors Influence on Land and H₂O

    • Terrestrial: Sunlight, temperature, precipitation, soil nutrients, fire frequency, wind, latitude, and altitude.
    • Aquatic/Marine: Light penetration (water clarity), water currents, dissolved nutrient concentrations, dissolved oxygen concentrations, and salinity.

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    Description

    This lesson explores the fundamental processes within ecosystems, including energy flow, nutrient cycles, and the roles of producers, consumers, and decomposers. It also describes the levels of ecological organization from individual organisms to entire ecosystems. Chemosynthesis and photosynthesis are compared.

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