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QLDBiologyQuick questions
Unit 2: Maintaining the internal environment
Quick questions on Thermoregulation in endotherms and ectotherms (QCE Biology Unit 2)
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is responses to heat (in endotherms)?Show answer
The hypothalamus heat-loss centre is activated.
What are responses in ectotherms?Show answer
Ectotherms rely mostly on behavioural responses.
What are endotherms?Show answer
Generate most of their body heat internally through high-rate metabolism. Maintain a roughly constant body temperature (around 37 degrees Celsius in mammals, 40 in birds) regardless of ambient temperature.
What are ectotherms?Show answer
Body temperature is set largely by the environment. Heat from metabolism is small; ectotherms rely on external heat sources.
What is q1?Show answer
Distinguish between endotherms and ectotherms with reference to source of body heat and an Australian example of each. [3 marks]
What is q2?Show answer
A human is exposed to 5 degrees Celsius for 30 minutes. Predict the changes in skin blood flow, sweat rate and shivering, and explain why each contributes to maintaining core temperature. [3 marks]
What is q3?Show answer
Refer to a desert reptile. (a) Identify two behavioural and one physiological adaptation for high-temperature regulation. (b) Predict the effect of a fever on enzyme activity in an ectotherm.
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