IB Biology HL 4.2.12 Energy transfer efficiency and feed conversion Question Bank

Practise IB Biology HL 4.2.12 by analysing losses between trophic levels and efficiency in animal production.

Exam points

Analyse respiration and assimilation losses that limit food-chain length.
Evaluate feed-conversion ratios and energy efficiency in animal production.

[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

Marking guidance:

Accept named trophic levels or named stages in a food chain in place of "trophic levels".

Accept if clearly shown in a diagram such as a pyramid of energy.

Not just respiration or heat.

3 max

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C4.2.12—Energy reductions question 1