Explain Energy Transfer Between Levels - Biology
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Identify energy at tertiary consumers if producers have $20{,}000$ kJ and transfers are $10%$ each step.
Identify energy at tertiary consumers if producers have $20{,}000$ kJ and transfers are $10%$ each step.
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$20$ kJ. Three $10%$ transfers: $20{,}000 \times 0.1^3 = 20$.
$20$ kJ. Three $10%$ transfers: $20{,}000 \times 0.1^3 = 20$.
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Which is larger in most ecosystems: energy in producers or energy in tertiary consumers?
Which is larger in most ecosystems: energy in producers or energy in tertiary consumers?
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Energy in producers. Producers have much more energy due to the $10%$ rule.
Energy in producers. Producers have much more energy due to the $10%$ rule.
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Which type of consumer typically has higher trophic efficiency: herbivore or carnivore?
Which type of consumer typically has higher trophic efficiency: herbivore or carnivore?
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Carnivore (animal tissue is generally more digestible than plant tissue). Animal tissues are more digestible than tough plant cell walls.
Carnivore (animal tissue is generally more digestible than plant tissue). Animal tissues are more digestible than tough plant cell walls.
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What is one biological reason plant-based trophic transfers are often less efficient?
What is one biological reason plant-based trophic transfers are often less efficient?
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Plant cell walls (cellulose/lignin) reduce digestibility. Cellulose and lignin are difficult to digest and reduce efficiency.
Plant cell walls (cellulose/lignin) reduce digestibility. Cellulose and lignin are difficult to digest and reduce efficiency.
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Which concept explains why top predators are fewer in number than producers?
Which concept explains why top predators are fewer in number than producers?
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Energy decreases at each trophic level, limiting population size. Less available energy supports smaller populations at higher levels.
Energy decreases at each trophic level, limiting population size. Less available energy supports smaller populations at higher levels.
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What is a food chain in terms of energy transfer?
What is a food chain in terms of energy transfer?
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A linear pathway of energy transfer through feeding relationships. Shows single pathway of who eats whom in sequence.
A linear pathway of energy transfer through feeding relationships. Shows single pathway of who eats whom in sequence.
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Calculate energy at the next level: producers have $10{,}000$ kJ; use the $10%$ rule.
Calculate energy at the next level: producers have $10{,}000$ kJ; use the $10%$ rule.
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$1{,}000$ kJ. Apply the $10%$ transfer rule: $10{,}000 \times 0.1 = 1{,}000$.
$1{,}000$ kJ. Apply the $10%$ transfer rule: $10{,}000 \times 0.1 = 1{,}000$.
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What term describes the total mass of living tissue at a trophic level?
What term describes the total mass of living tissue at a trophic level?
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Biomass. Total dry weight of living organisms at a trophic level.
Biomass. Total dry weight of living organisms at a trophic level.
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Which trophic level contains secondary consumers?
Which trophic level contains secondary consumers?
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The level that eats primary consumers. Carnivores that feed on herbivores (primary consumers).
The level that eats primary consumers. Carnivores that feed on herbivores (primary consumers).
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What is gross primary productivity (GPP) in an ecosystem?
What is gross primary productivity (GPP) in an ecosystem?
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Total energy captured by producers via photosynthesis. All energy captured before any is used for producer metabolism.
Total energy captured by producers via photosynthesis. All energy captured before any is used for producer metabolism.
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What is net primary productivity (NPP) in terms of energy available to consumers?
What is net primary productivity (NPP) in terms of energy available to consumers?
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Energy stored in producer biomass available to the next trophic level. Energy remaining after producers use some for their own respiration.
Energy stored in producer biomass available to the next trophic level. Energy remaining after producers use some for their own respiration.
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What form does most lost energy take as it moves through trophic levels?
What form does most lost energy take as it moves through trophic levels?
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Heat (thermal energy). Energy dissipates as heat during cellular respiration.
Heat (thermal energy). Energy dissipates as heat during cellular respiration.
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Which process is the main reason energy is lost between trophic levels?
Which process is the main reason energy is lost between trophic levels?
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Cellular respiration releasing energy as heat. Metabolic processes convert chemical energy to heat energy.
Cellular respiration releasing energy as heat. Metabolic processes convert chemical energy to heat energy.
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Which is larger in most ecosystems: biomass of producers or biomass of secondary consumers?
Which is larger in most ecosystems: biomass of producers or biomass of secondary consumers?
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Biomass of producers. Producers support all other levels and have the greatest biomass.
Biomass of producers. Producers support all other levels and have the greatest biomass.
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Which is larger in most ecosystems: energy in producers or energy in tertiary consumers?
Which is larger in most ecosystems: energy in producers or energy in tertiary consumers?
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Energy in producers. Producers have much more energy due to the $10%$ rule.
Energy in producers. Producers have much more energy due to the $10%$ rule.
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What term describes organisms that feed on detritus (dead organic matter) directly?
What term describes organisms that feed on detritus (dead organic matter) directly?
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Detritivores. Organisms that consume dead organic matter as their food source.
Detritivores. Organisms that consume dead organic matter as their food source.
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What happens to energy stored in dead organisms and waste products?
What happens to energy stored in dead organisms and waste products?
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It can be used by decomposers and detritivores, with heat released by respiration. Decomposers extract remaining energy, releasing heat through respiration.
It can be used by decomposers and detritivores, with heat released by respiration. Decomposers extract remaining energy, releasing heat through respiration.
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Identify the correct direction of energy flow in a food chain.
Identify the correct direction of energy flow in a food chain.
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From producers to consumers to decomposers, with heat lost at each step. Energy always flows from lower to higher trophic levels.
From producers to consumers to decomposers, with heat lost at each step. Energy always flows from lower to higher trophic levels.
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What is the minimum trophic level count in a food chain that includes producers and herbivores?
What is the minimum trophic level count in a food chain that includes producers and herbivores?
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Two trophic levels (producers and primary consumers). Producers form the base, herbivores are the second level.
Two trophic levels (producers and primary consumers). Producers form the base, herbivores are the second level.
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What is a food web in terms of energy transfer?
What is a food web in terms of energy transfer?
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A network of interconnected food chains showing multiple energy pathways. Multiple interconnected chains showing complex feeding relationships.
A network of interconnected food chains showing multiple energy pathways. Multiple interconnected chains showing complex feeding relationships.
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Which type of consumer typically has higher trophic efficiency: herbivore or carnivore?
Which type of consumer typically has higher trophic efficiency: herbivore or carnivore?
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Carnivore (animal tissue is generally more digestible than plant tissue). Animal tissues are more digestible than tough plant cell walls.
Carnivore (animal tissue is generally more digestible than plant tissue). Animal tissues are more digestible than tough plant cell walls.
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What is one biological reason plant-based trophic transfers are often less efficient?
What is one biological reason plant-based trophic transfers are often less efficient?
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Plant cell walls (cellulose/lignin) reduce digestibility. Cellulose and lignin are difficult to digest and reduce efficiency.
Plant cell walls (cellulose/lignin) reduce digestibility. Cellulose and lignin are difficult to digest and reduce efficiency.
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Which concept explains why top predators are fewer in number than producers?
Which concept explains why top predators are fewer in number than producers?
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Energy decreases at each trophic level, limiting population size. Less available energy supports smaller populations at higher levels.
Energy decreases at each trophic level, limiting population size. Less available energy supports smaller populations at higher levels.
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What is a trophic level in an ecosystem energy pyramid?
What is a trophic level in an ecosystem energy pyramid?
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A feeding position that shows energy flow through a food chain/web. Represents an organism's position in the energy flow hierarchy.
A feeding position that shows energy flow through a food chain/web. Represents an organism's position in the energy flow hierarchy.
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What is the primary energy source for most terrestrial food webs?
What is the primary energy source for most terrestrial food webs?
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Solar energy captured by producers via photosynthesis. Sunlight drives photosynthesis, the foundation of most food webs.
Solar energy captured by producers via photosynthesis. Sunlight drives photosynthesis, the foundation of most food webs.
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What term describes organisms that convert light energy into chemical energy?
What term describes organisms that convert light energy into chemical energy?
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Producers (autotrophs). They make their own food using light energy and $\text{CO}_2$.
Producers (autotrophs). They make their own food using light energy and $\text{CO}_2$.
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What term describes organisms that obtain energy by consuming other organisms?
What term describes organisms that obtain energy by consuming other organisms?
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Consumers (heterotrophs). They cannot produce their own food and must eat other organisms.
Consumers (heterotrophs). They cannot produce their own food and must eat other organisms.
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What is the typical fraction of energy transferred from one trophic level to the next?
What is the typical fraction of energy transferred from one trophic level to the next?
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About $10%$. Most energy is lost as heat during metabolic processes.
About $10%$. Most energy is lost as heat during metabolic processes.
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What is the name of the guideline that about $10%$ of energy passes to the next level?
What is the name of the guideline that about $10%$ of energy passes to the next level?
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The $10%$ rule (ecological efficiency guideline). A general guideline for energy transfer efficiency in ecosystems.
The $10%$ rule (ecological efficiency guideline). A general guideline for energy transfer efficiency in ecosystems.
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What is a food chain in terms of energy transfer?
What is a food chain in terms of energy transfer?
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A linear pathway of energy transfer through feeding relationships. Shows single pathway of who eats whom in sequence.
A linear pathway of energy transfer through feeding relationships. Shows single pathway of who eats whom in sequence.
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