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Energy Flow and Pyramids — Free MYP1 Sciences Practice Questions
1QuestionEfficiency of Energy TransferConcept Practice
2 marks~3 minCriterion A
The food chain below shows three organisms in order:
Grass → Rabbit → Fox
Grass → Rabbit → Fox
a
Identify the trophic level of the fox. [1]
b
Describe how the fox gets its energy in this food chain. [1]
Solutions
2QuestionPyramid of Numbers and BiomassAssessment Practice
2 marks~3 minCriterion D
A farmer uses 100 kg of grain to raise cows but gets only 10 kg of meat in return.
Describe one real-world impact of this energy loss on global food production. [2]
Describe one real-world impact of this energy loss on global food production. [2]
Solutions
3QuestionEfficiency of Energy TransferConcept Practice
3 marks~5 minCriterion C
The table below shows the energy available at each level in a grassland food chain.
| Level: Grass | Rabbit | Fox |
|---|---|---|
| Energy (kJ): 10 000 | 1 000 | 100 |
a
Identify the amount of energy available at the rabbit level. [1]
b
Describe what happens to the amount of energy as you move from grass to fox. [1]
c
A student says: "Rabbits pass all their energy to foxes." Describe why this is not correct, using the term "energy loss." [1]
Solutions
4QuestionPyramid of Numbers and BiomassConcept Practice
3 marks~5 minCriterion B
A meadow has the following organisms at each feeding level:
Producers: 5000
Primary consumers: 800
Secondary consumers: 200
Tertiary consumers: 10
Producers: 5000
Primary consumers: 800
Secondary consumers: 200
Tertiary consumers: 10
a
Identify the feeding level that has the fewest organisms. [1]
b
Describe what happens to the number of organisms as you move up the feeding levels. [1]
c
Compare the number of producers with the number of tertiary consumers. Use the data to explain what this difference tells you about the feeding levels. [1]
Solutions
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