Ecosystem

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Questions and Answers

What is the primary source of energy in a grazing food chain?

  • Photosynthesis (correct)
  • Detritivores
  • Dead organic matter
  • Decomposers

In which type of ecosystem is the detritus food chain a major conduit of energy flow?

  • Forest ecosystem
  • Aquatic ecosystem (correct)
  • Terrestrial ecosystem
  • Desert ecosystem

What happens to energy as it flows through trophic levels in a food chain?

  • Energy remains constant at each trophic level
  • Energy is only lost at the first trophic level
  • Energy is lost at each trophic level (correct)
  • Energy is gained at each trophic level

Which of the following organisms is an example of a detritivore?

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

In which type of ecosystem does a larger fraction of energy flow through the detritus food chain?

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

What is the primary characteristic of a grazing food chain?

<p>Energy is gained from photosynthesis (A)</p> Signup and view all the answers

What is the term used to describe each level in a food chain where energy transfer takes place?

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

Which organisms depend on the organisms at the lower trophic level for their energy demands?

<p>Organisms of a trophic level (C)</p> Signup and view all the answers

What is the term used to describe the total biomass of producers in a unit area?

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

What is the difference between fresh weight and dry weight in biomass measurement?

<p>Fresh weight is measured immediately after harvesting, while dry weight is measured after drying (C)</p> Signup and view all the answers

What is the term used to describe the amount of living matter present in different trophic levels at a given time?

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

What is the direction of energy flow in a food chain?

<p>From producers to top carnivores (A)</p> Signup and view all the answers

What happens to the energy when an organism dies and is not consumed by another animal?

<p>It is lost as heat during decomposition (A)</p> Signup and view all the answers

What is the role of decomposers in an ecosystem?

<p>They degrade dead organic matter into simple, inorganic materials (B)</p> Signup and view all the answers

What is the result of an animal being eaten by different animals in a food web?

<p>Different food chains get interconnected (D)</p> Signup and view all the answers

What is the term for the process of decomposers breaking down dead organic matter?

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

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

<p>A food web is more real than a food chain (B)</p> Signup and view all the answers

What is the role of earthworms in the detritus food chain?

<p>They feed on dead organic matter and further decompose detritus (B)</p> Signup and view all the answers

In a detritus food chain, what is the primary source of energy?

<p>Dead organic matter (B)</p> Signup and view all the answers

In which trophic level do producers occupy in a food chain?

<p>1st trophic level (D)</p> Signup and view all the answers

What is the primary difference between a grazing food chain and a detritus food chain?

<p>The source of energy (D)</p> Signup and view all the answers

In a terrestrial ecosystem, which type of food chain is a major conduit of energy flow?

<p>Detritus food chain (D)</p> Signup and view all the answers

What happens to energy as it flows through trophic levels in a detritus food chain?

<p>It is lost at each trophic level (D)</p> Signup and view all the answers

What is the significance of the 1st trophic level in a food chain?

<p>It is the level where producers occupy (D)</p> Signup and view all the answers

What is the fate of the biomass of plants that die without being consumed by animals?

<p>It is degraded by decomposers and released as heat. (A)</p> Signup and view all the answers

What is the primary source of energy for organisms at the 2nd trophic level?

<p>Producers at the 1st trophic level (A)</p> Signup and view all the answers

What is the role of earthworms in the detritus food chain?

<p>They are detritivores that feed on bacteria and fungi. (C)</p> Signup and view all the answers

What is the characteristic of energy flow in a food chain?

<p>Energy is lost as heat at each trophic level. (C)</p> Signup and view all the answers

In which type of ecosystem would you expect to find a higher standing crop of producers?

<p>Ecosystem with a high rate of primary production (C)</p> Signup and view all the answers

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

<p>A food chain is a linear sequence of organisms, while a food web is a network of interconnected food chains. (C)</p> Signup and view all the answers

What is the main consequence of energy transfer between trophic levels?

<p>A slight decrease in energy available to higher trophic levels (C)</p> Signup and view all the answers

Which type of food chain is characterized by the presence of decomposers?

<p>Detritus food chain (C)</p> Signup and view all the answers

What is the result of the interconnection of multiple food chains?

<p>The formation of a complex network of food chains, known as a food web. (B)</p> Signup and view all the answers

What is the role of decomposers in the ecosystem?

<p>They are organisms that break down dead organic matter and release nutrients. (C)</p> Signup and view all the answers

What is the primary function of top carnivores in a food chain?

<p>To regulate the population of herbivores (A)</p> Signup and view all the answers

What is the main difference between the biomass of producers expressed in fresh weight and dry weight?

<p>Fresh weight includes water content, while dry weight does not (D)</p> Signup and view all the answers

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