O LevelBiologyCambridgeExam Questions19. Relationships of Organisms with one another & with the Environment19.1 Energy Flow

Energy Flow (Cambridge O Level Biology)

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19.1 Energy Flow

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19.1 Energy Flow

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1
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A food chain is shown below. 

tree ➔ small insects ➔ small birds ➔ birds of prey

One of the pyramids of number below represents this food chain. 

image-3

Which one would be correct?

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    2
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    Which of the following diagrams show a pyramid of biomass for a forest?

    image-9

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      31 mark

      The diagram shows a pyramid of biomass for a food chain.

      Which level represents the producers?

      q3-19-1-energy-flow-medium-mcq-cie-o-level-biology

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        1
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        The image below shows a pyramid of biomass for a food chain in a rainforest ecosystem.

        image-10

        What would be an appropriate pyramid of numbers for this food chain?

        image-11

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          2
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          The image shows a food web. 

          lG-mZtON_image-5

          Which organism, from the food web, feeds on the greatest variety of organisms?

          • Whelks

          • Crabs

          • Limpets

          • Mussels

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          3
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          Which letter shows the path of the energy from the sun?

          • chemical energy in sugars → stored in plants → trapped in chlorophyll

          • trapped in chlorophyll → chemical energy in sugars → stored in plants

          • stored in plants → chemical energy in sugars →  trapped in chlorophyll

          • stored in plants → trapped in chlorophyll →  chemical energy in sugars 

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          41 mark

          These processes occur in living organisms in a food chain.

          1 excretion
          2 photosynthesis
          3 respiration


          Which processes would result in a loss of energy from a food chain? 

          • 1 and 2

          • 1 and 3

          •  2 only

          • 3 only

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          51 mark

          Which statements are correct?

          1 Energy cannot be recycled in food webs.
          2 Producers make their own organic nutrients.
          3 The Sun is the principal source of energy input to biological systems.

          • 1, 2 and 3

          • 1 and 2 only

          • 1 and 3 only

          • 2 and 3 only

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          61 mark

          When untreated sewage flows into a river, why does the oxygen concentration decrease?

          • Less oxygen is absorbed from the air

          • There is a decrease in the number of plants

          • There is an increase in the number of bacteria

          • There is an increase in the number of fish

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          1
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          Which statement gives the best explanation for why most food chains have no more than five trophic levels?

          • Because 20% of the energy is transferred at each level and after 5 levels, all the energy is used up (5 × 20% = 100%).

          • The numbers of organisms are insufficient because the top predator has to have a count of 1 in a pyramid of numbers. 

          • The biomass transferred from a consumer to the next-level consumer is too little.

          • There is a large amount of energy loss at each level so insufficient energy can be passed up to the sixth trophic level.

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          2
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          Look at the information about a food chain.

          Organism Number Biomass / kg
          Oak tree 1 400,000
          Aphids 9,000 900
          Predatory midges 120 45


          What is the percentage biomass of the aphids transferred to the midges?

          • 0.05 %

          • 1.3 %

          • 5%

          • 0.225 %

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          31 mark

          The graph shows changes in the populations of plant and animal plankton (microscopic organisms) in a lake. q3-19-1-energy-flow-medium-mcq-cie-o-level-biology-2

          Consider the following statement in relation to the data provided by the graph.

          ‘Population changes in animal plankton occur after similar changes in plant plankton because the animals feed on the plants.’

          Which description fits this statement?

          • It is a possible interpretation of the data.

          • The data do not support the statement.

          • The data are too random to be interpreted.

          • It is the only way to interpret the data

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