CH 8: Energy Flow
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Questions and Answers

What is the role of autotrophs in an ecosystem?

  • Convert solar energy into chemical energy (correct)
  • Obtain energy from secondary consumers
  • Consume primary consumers
  • Feed on apex predators

Why do primary consumers receive only around 10% of the energy stored by plants?

  • Primary consumers are inefficient in energy absorption
  • Energy is lost through metabolic processes and heat (correct)
  • They do not need as much energy
  • Plants reserve most of the energy for themselves

Which group of organisms gains about 1% of the energy captured by producers?

  • Secondary Consumers (correct)
  • Primary Consumers
  • Autotrophs
  • Tertiary Consumers

What is the main reason for the decrease in energy availability as you move up the trophic levels?

<p>Energy loss due to metabolic processes and heat (D)</p> Signup and view all the answers

Which organisms are considered apex predators in an ecosystem?

<p>Tertiary Consumers (C)</p> Signup and view all the answers

What is the primary source of energy for all organisms in an ecosystem?

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

What is the role of decomposers in an ecosystem?

<p>They recycle nutrients back into the ecosystem (D)</p> Signup and view all the answers

Which trophic level typically has the largest number of organisms?

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

Which type of pyramid shows the total mass of living material at each trophic level?

<p>Pyramid of Biomass (A)</p> Signup and view all the answers

What could be the potential impact of removing a hyena from a food web?

<p>Increase in the population of primary and secondary consumers (D)</p> Signup and view all the answers

Which of the following is a primary consumer in a grassland ecosystem?

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

What is the final product of photosynthesis?

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

Which of the following provides a more complex and realistic depiction of feeding relationships within an ecosystem?

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

Which trophic level is occupied by the organisms that are least in number due to the highest energy loss?

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

What is the role of a leopard in a grassland ecosystem?

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

What is the significance of energy pyramids in understanding ecological dynamics?

<p>They represent energy content at each level, showing a clear and consistent decrease in energy as one moves up the pyramid (B)</p> Signup and view all the answers

What happens to the energy as it flows through various trophic levels in an ecosystem?

<p>It decreases at each level. (A)</p> Signup and view all the answers

Which organisms form the basis of the food chain in an ecosystem by converting solar energy into chemical energy through photosynthesis?

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

In an ecosystem, which group of organisms receives about 1% of the energy originally captured by the producers?

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

What is the primary source of energy for all organisms in an ecosystem?

<p>Solar energy from sunlight (D)</p> Signup and view all the answers

Which trophic level typically has organisms that consume plants to obtain energy?

<p>Primary Consumers (Herbivores) (B)</p> Signup and view all the answers

What is the role of apex predators in an ecosystem's trophic structure?

<p>To regulate the population of primary consumers (B)</p> Signup and view all the answers

What type of organisms are eagles and sharks in an ecosystem?

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

How do autotrophs contribute to the energy flow in an ecosystem?

<p>By converting solar energy into chemical energy (D)</p> Signup and view all the answers

Which group of organisms gains about 0.1% of the energy initially fixed by the producers?

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

What is the main reason for the significant loss of energy as it flows through various trophic levels in an ecosystem?

<p>Heat loss during energy transfer processes (A)</p> Signup and view all the answers

Which organism in a grassland ecosystem occupies the third trophic level?

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

Which organisms are responsible for breaking down dead organic matter into nutrients for the ecosystem?

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

Which of the following best represents the relationship between trophic levels in a food chain?

<p>A decrease in biomass and energy as you move up the trophic levels (C)</p> Signup and view all the answers

In a food web, if a hyena is removed, which of the following could result?

<p>An increase in the population of secondary consumers (A)</p> Signup and view all the answers

Which of the following is not a type of pyramid used to represent energy flow in an ecosystem?

<p>Pyramid of Species (B)</p> Signup and view all the answers

Which of the following is not a step in photosynthesis?

<p>Sunlight + Water → Glucose + Oxygen (A)</p> Signup and view all the answers

Which organism in a grassland ecosystem is most likely to be affected by an increase in the population of primary consumers?

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

Which of the following is a primary consumer in a grassland ecosystem?

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

Which trophic level is most affected by energy loss during trophic transfer?

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

Which of the following is not a benefit of a food web over a food chain?

<p>Illustrates the flow of energy in a simple and linear manner (B)</p> Signup and view all the answers

What is the primary reason for the significant loss of energy as it flows through various trophic levels in an ecosystem?

<p>Energy used for growth and life activities (A)</p> Signup and view all the answers

Which organisms typically receive about 1% of the energy originally captured by the producers in an ecosystem?

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

Why do tertiary consumers, such as eagles and sharks, only gain about 0.1% of the energy initially fixed by the producers?

<p>High metabolic losses (C)</p> Signup and view all the answers

Which organisms form the basis of the food chain by converting solar energy into chemical energy through photosynthesis?

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

What is the role of autotrophs (producers) in an ecosystem's energy flow?

<p>Converting solar energy into chemical energy (A)</p> Signup and view all the answers

Which trophic level typically has organisms that consume plants to obtain energy?

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

What happens to the unused energy in an ecosystem?

<p>Converted into heat and lost (A)</p> Signup and view all the answers

What is the major role of decomposers in an ecosystem's energy dynamics?

<p>Converting dead organic matter into nutrients for producers (B)</p> Signup and view all the answers

How do primary consumers contribute to the overall energy flow in an ecosystem?

<p>By consuming producers and kicking off the food chain (C)</p> Signup and view all the answers

What process allows producers to store energy for primary consumers?

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

Which trophic level has the most significant impact on a grassland ecosystem's stability?

<p>Secondary consumers (C)</p> Signup and view all the answers

Which type of organism is responsible for releasing oxygen in a food chain?

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

Which organism directly impacts the energy available at the secondary consumer trophic level?

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

Which type of pyramid best represents the relationship between trophic levels in a grassland ecosystem?

<p>Pyramid of energy (A)</p> Signup and view all the answers

Which organism has the largest impact on the biomass in a grassland ecosystem?

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

Which organism plays a crucial role in nutrient recycling in a grassland ecosystem?

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

Which organism exhibits the most complex feeding relationships in a grassland ecosystem?

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

Which organism is responsible for directly transferring energy from producers to apex predators in a grassland ecosystem?

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

Which organism is the most affected by energy loss during trophic transfer in a grassland ecosystem?

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

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