Read Temperature and Metabolism
A focused NSEB read for the temperature and metabolism pattern. Learn the linked concept, then apply it in the source questions.
Temperature and Metabolism is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Temperature and Metabolism
Respiration responds differently to ambient temperature. An ectotherm shows strong dependence of metabolic/respiratory rate on environmental temperature, whereas an endotherm regulates internal temperature and shows a different relationship. In the graph, curve I is consistent with an ectothermic fish and curve II with an endothermic mammal. Thus Mackerel fish - Kangaroo is the appropriate pairing.
Brown-fat thermogenesis
Brown-adipose UCP₁ lets protons return across the inner mitochondrial membrane without ATP synthesis. The energy is released as heat through non-shivering thermogenesis; it is not a shivering mechanism.
Link water oxygen to ectotherm demand
As water warms, dissolved oxygen falls. Fish are ectotherms, so both resting and active oxygen consumption rise with temperature; active fish remain above resting fish at each temperature. Select the graph with falling water oxygen, two rising fish-demand curves, and the active curve higher than the resting curve. Choose D.
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- ✓Respiration responds differently to ambient temperature
- ✓Warm water holds less dissolved oxygen while ectotherm oxygen demand rises with temperature.
Read the conditions in the stem carefully and use the stated model, labels, or assumptions before choosing an answer.
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