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CAIE IGCSE Biology 19.2.17 Inefficient Energy Transfer

Practise calculating energy loss and explaining why only part of the energy at one trophic level reaches the next.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • calculate energy lost or percentage transferred from values in a food-chain diagram
  • explain losses through respiration, movement, heat, uneaten material and egestion
  • link lower energy availability at higher trophic levels to reduced supported biomass

19.2.17—Transfer of energy from one trophic question 1

[Maximum number: 3]

A student recorded the information about an aquatic habitat.
Fig. 4.1 shows the student's notes.

Fig. 4.1

Fig. 4.1

Outline how the energy in the primary consumers in this aquatic food web is used to produce biomass in the secondary consumers.

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