Ecological Niches and Respiration Modes
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Questions and Answers

No two species can fill the same niche within a habitat.

True (A)

What are the three types of anaerobic respiration?

  • Anaerobic aerobes
  • Obligate anaerobes (correct)
  • Facultative anaerobes (correct)
  • Obligate aerobes (correct)
  • Organisms that cannot tolerate oxygen are called obligate aerobes.

    False (B)

    What is the key characteristic of an autotroph?

    <p>They synthesize their own organic molecules from simple inorganic substances.</p> Signup and view all the answers

    What type of organism obtains energy from other organisms?

    <p>Heterotrophs</p> Signup and view all the answers

    Which of these is NOT a method by which heterotrophs obtain organic molecules?

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

    What is the difference between a consumer and a detritivore?

    <p>Consumers ingest organic molecules from living or recently killed organisms, while detritivores ingest organic molecules from the non-living remnants of organisms.</p> Signup and view all the answers

    Which of these is NOT an example of a detritivore?

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

    What is the primary role of saprotrophs in an ecosystem?

    <p>They decompose dead organic matter, releasing nutrients back into the ecosystem.</p> Signup and view all the answers

    What is the defining characteristic of a mixotroph?

    <p>They can use both autotrophic and heterotrophic methods of nutrition.</p> Signup and view all the answers

    Euglena gracilis is an example of an obligate mixotroph.

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

    How do phototrophic archaea obtain energy?

    <p>They use light energy.</p> Signup and view all the answers

    What is chemosynthesis?

    <p>The process of using chemicals to create energy for the production of organic molecules.</p> Signup and view all the answers

    All heterotrophic archaea are chemoheterotrophs.

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

    What is the study of skulls, jaws, and teeth called?

    <p>Craniodental morphology</p> Signup and view all the answers

    What is an adaptation that herbivores have for consuming plant matter?

    <p>Specialized mouthparts, such as stylets for piercing sugar sap or mandibles for cutting leaves.</p> Signup and view all the answers

    How do ruminants digest plant matter?

    <p>They have a multi-compartment stomach and specialized bacteria to break down cellulose.</p> Signup and view all the answers

    Which of these is NOT a plant adaptation against herbivory?

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

    What are the two main types of venoms produced by predators?

    <p>Haemotoxic (affecting the circulatory system) and neurotoxic (affecting the nervous system).</p> Signup and view all the answers

    Which of these is NOT a type of predator behavior?

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

    What is the definition of a niche?

    <p>The role of a species within its habitat, including its interactions with both biotic and abiotic factors.</p> Signup and view all the answers

    What is the difference between a fundamental niche and a realized niche?

    <p>The fundamental niche is the full range of conditions a species could occupy based on its adaptations, while the realized niche is the actual range it occupies due to biotic interactions.</p> Signup and view all the answers

    What is competitive exclusion?

    <p>The elimination of a competing species from its niche due to one species outcompeting the other for resources.</p> Signup and view all the answers

    Two different species can occupy the same niche indefinitely without one outcompeting the other.

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

    Flashcards

    Competitive Exclusion

    A niche can only be occupied by one species; competition leads to one out-competing the other.

    Heterotrophs

    Organisms that obtain organic molecules from other organisms, acting as consumers.

    Autotrophs

    Organisms that synthesize their own organic molecules from simple substances like CO2.

    Obligate Anaerobes

    Single-celled organisms that can only survive in oxygen-free environments.

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    Facultative Anaerobes

    Organisms that primarily respire aerobically but can switch to anaerobic respiration if needed.

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    Obligate Aerobes

    Organisms that must have oxygen to survive.

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    Mixotrophs

    Organisms that use both autotrophic and heterotrophic nutrition depending on availability.

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    Detritivores

    Consumers that ingest non-living organic matter like detritus.

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    Saprotrophs

    Decomposers that absorb nutrients by secreting digestive enzymes on non-living organic matter.

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    Modes of Nutrition

    The various ways organisms obtain energy and nutrients.

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    Chemical Adaptations of Predators

    Features like venoms and scent camouflage used by predators for hunting.

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    Behavioural Adaptations of Predators

    Different hunting strategies such as ambush, pack, or pursuit.

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    Plant adaptations against herbivory

    Strategies like spines and toxins to deter plant-eaters.

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    Niche

    The role of a species within its habitat, including biotic and abiotic interactions.

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    Fundamental Niche

    The full potential conditions and resources a species can use without competition.

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    Realized Niche

    The actual conditions and resources a species uses due to competition and biotic interactions.

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    Adaptations for Herbivory

    Features like specialized mouthparts and digestive systems in plant-eating animals.

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    Nutrition in Archaea

    Single-celled organisms that may be phototrophic, chemotrophic, or heterotrophic.

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    Nutrition in Hominidae

    Study focus on skulls, jaws, and teeth for dietary understanding.

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    Study Notes

    Ecological Niches

    • No two species can occupy the same niche: Direct competition for resources will inevitably lead to one species outcompeting the other, potentially driving the less successful species to extinction.

    Modes of Respiration

    • Obligate anaerobes: These single-celled organisms require oxygen-free environments (e.g., deep soil, water, inside other organisms) for survival because they can only carry out anaerobic respiration.

    • Facultative anaerobes: These organisms primarily use aerobic respiration but can switch to anaerobic respiration if oxygen is unavailable. Examples include brewer's yeast and Escherichia coli.

    • Obligate aerobes: Unable to survive without oxygen, they rely solely on aerobic respiration. Animals, fungi, and many other organisms fall into this category.

    Autotrophs

    • Producers: Autotrophs synthesize their own organic molecules (e.g., carbohydrates) from inorganic substances (e.g., CO2, nitrates). They use energy from sunlight (photosynthesis) or chemical reactions (chemosynthesis). They are the base of most food chains.

    Heterotrophs

    • Consumers: Heterotrophs obtain organic molecules from other organisms (living or recently killed). They are broadly categorized as:

      • Herbivores: Feed on plants.
      • Carnivores: Feed on animals.
      • Omnivores: Feed on both plants and animals.
    • Detritivores: Consume non-living organic matter (e.g., detritus, humus). Examples include dung beetles, earthworms, and woodlice.

    • Saprotrophs (Decomposers): Release digestive enzymes and absorb the resulting products for nutrients. Bacteria and fungi are key decomposers.

    Mixotrophs

    • Dual Nutrition: Mixotrophs utilize both autotrophic and heterotrophic methods depending on available resources. Euglena gracilis, for example, can photosynthesize (autotrophic) or consume other organisms (heterotrophic).

    Nutrition in Archaea

    • Diverse Metabolic Strategies: Archaea exhibit various nutritional strategies:

      • Photoheterotrophs: Capture light energy to produce ATP but require organic compounds for carbon.
      • Chemoautotrophs: Obtain energy from chemical reactions to produce their own organic carbon.
      • Chemoheterotrophs: Utilize chemical energy and obtain organic compounds from other organisms for carbon.

    Adaptations for Herbivory

    • Specialized structures: Herbivores can have adapted mouthparts (e.g., mandibles, stylets) for consuming plants.
    • Digestive systems: Ruminants (e.g., cattle, deer) have specialized multi-compartment stomachs allowing them to re-chew and digest cellulose.

    Plant Adaptations Against Herbivory

    • Mechanical deterrents: Spines, tough bark, and hairs discourage herbivores.
    • Chemical defenses: Plants produce toxins (e.g., alkaloids, tannins) that harm or deter herbivores.

    Predator Adaptations

    • Chemical defenses: Predators may have venoms (haemotoxic or neurotoxic) or chemical mimicry/pheromones.
    • Behavioral strategies: Predators employ various hunting methods (e.g., ambush, pack hunting, pursuit).

    Niche Concepts

    • Niche: A species' role within its habitat encompassing biotic and abiotic interactions.

    • Fundamental niche: The full range of conditions and resources a species could use.

    • Realized niche: The actual conditions and resources a species does use due to biotic interactions.

    • Competitive exclusion: Only one species can occupy a specific niche. If two species compete, either one will outcompete the other, the losing species will either shift to a different niche or face extinction.

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    Description

    Explore the concepts of ecological niches and the different modes of respiration in organisms. This quiz covers the competition among species, the distinctions between obligate and facultative anaerobes, and the role of autotrophs. Dive into the fascinating world of ecology and physiology!

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