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Questions and Answers
No two species can fill the same niche within a habitat.
No two species can fill the same niche within a habitat.
True (A)
What are the three types of anaerobic respiration?
What are the three types of anaerobic respiration?
Organisms that cannot tolerate oxygen are called obligate aerobes.
Organisms that cannot tolerate oxygen are called obligate aerobes.
False (B)
What is the key characteristic of an autotroph?
What is the key characteristic of an autotroph?
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What type of organism obtains energy from other organisms?
What type of organism obtains energy from other organisms?
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Which of these is NOT a method by which heterotrophs obtain organic molecules?
Which of these is NOT a method by which heterotrophs obtain organic molecules?
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What is the difference between a consumer and a detritivore?
What is the difference between a consumer and a detritivore?
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Which of these is NOT an example of a detritivore?
Which of these is NOT an example of a detritivore?
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What is the primary role of saprotrophs in an ecosystem?
What is the primary role of saprotrophs in an ecosystem?
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What is the defining characteristic of a mixotroph?
What is the defining characteristic of a mixotroph?
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Euglena gracilis is an example of an obligate mixotroph.
Euglena gracilis is an example of an obligate mixotroph.
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How do phototrophic archaea obtain energy?
How do phototrophic archaea obtain energy?
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What is chemosynthesis?
What is chemosynthesis?
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All heterotrophic archaea are chemoheterotrophs.
All heterotrophic archaea are chemoheterotrophs.
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What is the study of skulls, jaws, and teeth called?
What is the study of skulls, jaws, and teeth called?
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What is an adaptation that herbivores have for consuming plant matter?
What is an adaptation that herbivores have for consuming plant matter?
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How do ruminants digest plant matter?
How do ruminants digest plant matter?
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Which of these is NOT a plant adaptation against herbivory?
Which of these is NOT a plant adaptation against herbivory?
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What are the two main types of venoms produced by predators?
What are the two main types of venoms produced by predators?
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Which of these is NOT a type of predator behavior?
Which of these is NOT a type of predator behavior?
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What is the definition of a niche?
What is the definition of a niche?
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What is the difference between a fundamental niche and a realized niche?
What is the difference between a fundamental niche and a realized niche?
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What is competitive exclusion?
What is competitive exclusion?
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Two different species can occupy the same niche indefinitely without one outcompeting the other.
Two different species can occupy the same niche indefinitely without one outcompeting the other.
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Flashcards
Competitive Exclusion
Competitive Exclusion
A niche can only be occupied by one species; competition leads to one out-competing the other.
Heterotrophs
Heterotrophs
Organisms that obtain organic molecules from other organisms, acting as consumers.
Autotrophs
Autotrophs
Organisms that synthesize their own organic molecules from simple substances like CO2.
Obligate Anaerobes
Obligate Anaerobes
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Facultative Anaerobes
Facultative Anaerobes
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Obligate Aerobes
Obligate Aerobes
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Mixotrophs
Mixotrophs
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Detritivores
Detritivores
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Saprotrophs
Saprotrophs
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Modes of Nutrition
Modes of Nutrition
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Chemical Adaptations of Predators
Chemical Adaptations of Predators
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Behavioural Adaptations of Predators
Behavioural Adaptations of Predators
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Plant adaptations against herbivory
Plant adaptations against herbivory
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Niche
Niche
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Fundamental Niche
Fundamental Niche
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Realized Niche
Realized Niche
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Adaptations for Herbivory
Adaptations for Herbivory
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Nutrition in Archaea
Nutrition in Archaea
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Nutrition in Hominidae
Nutrition in Hominidae
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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
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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.
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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.
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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
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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.
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Detritivores: Consume non-living organic matter (e.g., detritus, humus). Examples include dung beetles, earthworms, and woodlice.
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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
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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
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Niche: A species' role within its habitat encompassing biotic and abiotic interactions.
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Fundamental niche: The full range of conditions and resources a species could use.
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Realized niche: The actual conditions and resources a species does use due to biotic interactions.
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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!