IB Biology HL C4.2.12 Energy Reductions Questions

Analyse respiration, heat, egestion, excretion and uneaten biomass losses, calculate transfer efficiency and evaluate animal feed-conversion ratios in IB Biology HL C4.2.12.

Exam points

Explain how respiration, heat, egestion, excretion and uneaten biomass reduce energy available at successive trophic levels and limit food-chain length.
Calculate or evaluate transfer efficiency between named trophic levels using supplied energy-flow data.

[Maximum number: 3]

Outline how the energy flow through food chains limits their length.

a. only a small proportion/20 \%/10\% «of energy» can pass from one trophic level to the next

OR large proportion/80 \%/90\% lost between one trophic level and the next

b. energy released by respiration AND lost as heat

c. energy losses due to uneaten parts/undigested parts/feces/egestion

d. not enough energy for $4^{\text {th }} / 5^{\text {th }} /$ later stages of a food chain

OR

more energy available if feeding at an earlier stage in a food chain

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IB Biology HL C4.2.12 Energy Reductions Questions question 1