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IB Biology HL C1.1.12 Hl Heat Generation Questions

Practise IB Biology HL 1.1.12 by applying heat generation concepts to exam questions.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare basal metabolic rate and metabolic heat generation between endotherms in contrasting climates and body masses.
  • Explain greater heat loss in cold environments and relate body mass or surface-area-to-volume ratio to heat-generation demand.

Learn this topic

Study C1.1.12 (HL)—Heat generation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C1.1.12 Hl Heat Generation Questions question 1

[Maximum number: 4]

Common bottlenose dolphins, Tursiops truncatus, are marine mammals of temperate and tropical oceans throughout the world, where they feed on fish, squid and crustaceans.

Research has been carried out on a population of these dolphins in Sarasota Bay, Florida. The table shows the mean sea surface temperature in Sarasota Bay and catch per unit effort (CPUE) in winter and summer. A large CPUE indicates it would take little effort for the dolphin to catch a lot of prey.

Table for Question IB Biology HL C1.1.12 Hl Heat Generation Questions question 1 — IB Biology HL

Question (a)

(a)

Explain the differences in BMR between desert and polar mammals up to a mass of 103 g10^{3} \mathrm{~g}.

[ 2 ]

Question (b)

(b)

Above a body mass of 10 kg , there is little difference in BMR between desert and polar mammals. Suggest reasons for this.

[ 2 ]
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