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Energy Flow and Pyramids — Free MYP3 Sciences Practice Questions
1QuestionEfficiency of Energy TransferConcept Practice
2 marks~3 minCriterion B
The diagram shows a food chain with the following energy values:
Grass: 10 000 J
Rabbit: 1 000 J
Fox: 100 J
Describe the pattern of energy change as energy moves through this food chain, and explain what happens to the energy that is not transferred to the next trophic level. [2]
Grass: 10 000 J
Rabbit: 1 000 J
Fox: 100 J
Describe the pattern of energy change as energy moves through this food chain, and explain what happens to the energy that is not transferred to the next trophic level. [2]
Solutions
2QuestionEfficiency of Energy TransferAssessment Practice
2 marks~3 minCriterion D
When animals such as cattle eat crops, only about of the energy from those crops is transferred to the animal's body. The remaining is lost through movement, body heat, and waste.
Explain why eating crops such as rice or beans directly is more sustainable than eating meat from animals raised on those crops. In your answer, refer to energy transfer efficiency. [2]
Explain why eating crops such as rice or beans directly is more sustainable than eating meat from animals raised on those crops. In your answer, refer to energy transfer efficiency. [2]
Solutions
3QuestionEfficiency of Energy TransferConcept Practice
3 marks~5 minCriterion A
A grassland food chain transfers energy as follows:
Grass (producer): 10 000 kJ
Rabbit (primary consumer): 1 000 kJ
Fox (secondary consumer): 100 kJ
Grass (producer): 10 000 kJ
Rabbit (primary consumer): 1 000 kJ
Fox (secondary consumer): 100 kJ
a
Calculate the percentage of energy transferred from grass to rabbit. Show your working. [1]
b
Calculate the percentage of energy transferred from rabbit to fox. Show your working. [1]
c
Explain why energy decreases at each trophic level in this food chain. [1]
Solutions
4QuestionEfficiency of Energy TransferAssessment Practice
3 marks~5 minCriterion C
The diagram below shows a food chain with energy values at each trophic level.
Grass (10 000 kJ) → Rabbit (1 000 kJ) → Fox (100 kJ)
Grass (10 000 kJ) → Rabbit (1 000 kJ) → Fox (100 kJ)
a
State the term for the percentage of energy transferred from one trophic level to the next. [1]
b
Calculate the percentage of energy transferred from grass to rabbit. Show all working. [1]
c
A student claims that the fox is a more efficient predator than the rabbit because it is faster. Using the data above, explain whether this claim is correct. [1]
Solutions
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