Gr 8 Natural Sciences Ch 1.2: Energy flow: Food chains and food webs
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Questions and Answers

What is the primary source of energy in an ecosystem?

  • Grasshoppers
  • Frogs
  • Plants and algae
  • The sun (correct)

    • What percentage of energy is converted into biomass at each trophic level?

  • 10% (correct)
  • 20%
  • 50%
  • 5%

    • What is the term for the graphical representation of energy available at each trophic level in an ecosystem?

  • Energy Pyramid (correct)
  • Food Web
  • Trophic Level Chart
  • Energy Flow Diagram

    • What is the role of primary consumers in an ecosystem?

    <p>They consume producers</p> Signup and view all the answers

    What is the term for the level of energy consumption in a food chain?

    <p>Trophic level</p> Signup and view all the answers

    What is the term for the linear sequence of organisms where each is eaten by the next member in the chain?

    <p>Food Chain</p> Signup and view all the answers

    What is the primary difference between a food chain and a food web?

    <p>Complexity of feeding relationships</p> Signup and view all the answers

    Why do energy pyramids have a pyramid shape?

    <p>Because energy is lost at each trophic level</p> Signup and view all the answers

    What is the term for an organism that eats secondary consumers?

    <p>Tertiary Consumer</p> Signup and view all the answers

    What is the term for each step in a food chain or food web?

    <p>Trophic Level</p> Signup and view all the answers

    What is the benefit of biodiversity in ecosystems?

    <p>Enhanced efficiency of energy flow</p> Signup and view all the answers

    What might happen if phytoplankton are removed from a marine ecosystem?

    <p>Small fish population would decrease</p> Signup and view all the answers

    What happens to energy as it is transferred from one trophic level to the next?

    <p>It decreases significantly</p> Signup and view all the answers

    What occupies the second trophic level in a food chain?

    <p>Primary consumers</p> Signup and view all the answers

    What is the term for the complex network of interconnected food chains within an ecosystem?

    <p>Food Web</p> Signup and view all the answers

    What is the term for the organisms that eat secondary consumers?

    <p>Tertiary consumers</p> Signup and view all the answers

    What is the primary function of photosynthesis in an ecosystem?

    <p>To capture sunlight and convert it into chemical energy</p> Signup and view all the answers

    Which organism occupies the third trophic level in the following food chain: Sun → Grass → Grasshopper → Frog → Snake?

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

    What is the main reason for the energy loss at each trophic level in a food chain?

    <p>Because energy is lost as heat during each transfer</p> Signup and view all the answers

    What is the term for a network of interconnected food chains within an ecosystem?

    <p>Food web</p> Signup and view all the answers

    Which of the following is NOT a characteristic of energy flow in ecosystems?

    <p>Energy is created by consumers</p> Signup and view all the answers

    What is the term for an organism that eats producers?

    <p>Primary consumer</p> Signup and view all the answers

    Why is it important to understand energy flow in ecosystems?

    <p>To comprehend the dynamics of ecosystem balance and maintenance</p> Signup and view all the answers

    What happens to the energy available at each trophic level as you move up the food chain?

    <p>It decreases</p> Signup and view all the answers

    What is the primary reason for the pyramid shape of energy pyramids?

    <p>Because energy is lost at each trophic level</p> Signup and view all the answers

    What is the main benefit of having multiple food chains in a food web?

    <p>It increases the stability and resilience of the ecosystem</p> Signup and view all the answers

    What would happen to primary consumers if producers were removed from an ecosystem?

    <p>They would lose their food source and their population would decline</p> Signup and view all the answers

    Why is it important to have a diverse array of species in an ecosystem?

    <p>It enhances the efficiency of energy flow in the ecosystem</p> Signup and view all the answers

    What would happen if a key species were removed from a food web?

    <p>The ecosystem would experience a cascading effect</p> Signup and view all the answers

    Which of the following is an example of a tertiary consumer in an ecosystem?

    <p>An eagle consuming a snake</p> Signup and view all the answers

    What is the main difference between a food chain and a food web?

    <p>A food web shows the diverse feeding relationships among organisms</p> Signup and view all the answers

    What is the significance of the second trophic level in an ecosystem?

    <p>It is the level where primary consumers occupy</p> Signup and view all the answers

    What is the primary purpose of understanding energy flow in ecosystems?

    <p>To comprehend ecosystem dynamics and maintain ecological balance</p> Signup and view all the answers

    What is the result of energy transfer between trophic levels?

    <p>Energy is lost at each trophic level</p> Signup and view all the answers

    What is the role of plants, algae, and certain bacteria in ecosystems?

    <p>They capture sunlight through photosynthesis</p> Signup and view all the answers

    What is the characteristic of energy pyramids?

    <p>They have a pyramid shape due to energy loss</p> Signup and view all the answers

    What is the difference between a food chain and a food web?

    <p>A food web is a complex network of interconnected food chains</p> Signup and view all the answers

    What is the significance of trophic levels in ecosystems?

    <p>They indicate the energy available at each level</p> Signup and view all the answers

    What would happen to a food web if a key species were removed?

    <p>The food web would experience a shift in population dynamics</p> Signup and view all the answers

    What is the ultimate source of energy for all life processes in ecosystems?

    <p>The sun</p> Signup and view all the answers

    What is the primary reason for the decrease in available energy as you move up the trophic levels in an energy pyramid?

    <p>Energy is lost as heat during metabolic processes</p> Signup and view all the answers

    What is the role of biodiversity in energy flow in ecosystems?

    <p>It enhances the efficiency of energy flow by reducing fluctuations in population sizes</p> Signup and view all the answers

    What is the significance of the interconnected nature of food webs?

    <p>It enhances the stability and resilience of ecosystems by allowing for adjustments among species</p> Signup and view all the answers

    What would happen to secondary consumers if primary consumers were removed from an ecosystem?

    <p>They would experience a decrease in population size</p> Signup and view all the answers

    What is the benefit of having multiple food chains in a food web?

    <p>It allows for the distribution of energy more evenly among species</p> Signup and view all the answers

    What is the primary consequence of removing a key species from a food web?

    <p>It would lead to a cascade of effects on the entire ecosystem</p> Signup and view all the answers

    What is the significance of the base level in an energy pyramid?

    <p>It has the most amount of energy available</p> Signup and view all the answers

    What is the primary difference between food chains and food webs?

    <p>Food chains are linear, while food webs are complex networks of interconnected food chains</p> Signup and view all the answers

    What is the primary reason for the inefficiency of energy transfer between trophic levels?

    <p>Because energy is lost as heat at each trophic level.</p> Signup and view all the answers

    What would happen to an ecosystem if all tertiary consumers were removed?

    <p>The secondary consumers would experience an increase in population.</p> Signup and view all the answers

    What is the primary benefit of having multiple food chains in a food web?

    <p>It provides redundancy and stability to the ecosystem.</p> Signup and view all the answers

    What is the characteristic of energy flow in ecosystems that leads to the pyramid shape of energy pyramids?

    <p>Energy decreases at each trophic level.</p> Signup and view all the answers

    What would happen to primary consumers if all producers were removed from an ecosystem?

    <p>They would experience a decrease in population.</p> Signup and view all the answers

    What is the primary consequence of having a diverse array of species in an ecosystem?

    <p>It enhances the stability and resilience of the ecosystem.</p> Signup and view all the answers

    What is the primary role of photosynthesis in ecosystems?

    <p>To capture sunlight and convert it into chemical energy.</p> Signup and view all the answers

    What is the primary reason for the importance of understanding energy flow in ecosystems?

    <p>To comprehend the mechanisms of energy transfer and relationships within food chains and food webs.</p> Signup and view all the answers

    What is the main consequence of the significant energy loss at each trophic level?

    <p>A pyramid-shaped energy distribution in ecosystems</p> Signup and view all the answers

    What is the primary reason for the importance of key species in food webs?

    <p>They have a significant impact on the population of other species</p> Signup and view all the answers

    What is the primary benefit of a diverse array of species in ecosystems?

    <p>Enhanced stability and resilience in ecosystems</p> Signup and view all the answers

    What is the primary difference between the second and third trophic levels?

    <p>Species in the second level eat producers, while species in the third level eat primary consumers</p> Signup and view all the answers

    What is the primary consequence of removing producers from an ecosystem?

    <p>Primary consumers would lose their food source</p> Signup and view all the answers

    What is the primary benefit of energy pyramids in understanding ecosystems?

    <p>They illustrate the energy available at each trophic level</p> Signup and view all the answers

    What is the primary reason for the stability and resilience of ecosystems?

    <p>The interconnected nature of food webs</p> Signup and view all the answers

    What is the primary consequence of having multiple food chains in a food web?

    <p>Enhanced stability and resilience in ecosystems</p> Signup and view all the answers

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