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Why does a desert lizard bask on rocks in the morning but move into shade or burrows as the day heats up?

Answer: It is a partial regulator using behaviour to manage body temperature.

  • A It is a regulator maintaining constant temperature metabolically
  • B It is migrating to a new habitat permanently
  • C It is a partial regulator using behaviour to manage body temperature
  • D It is entering diapause to survive heat

Correct answer: C. It is a partial regulator using behaviour to manage body temperature

Explanation: Lacking internal thermoregulation, the lizard uses behavioural means, basking to warm up and moving to shade to cool, a partial form of regulation.

Exponential (J-curve) vs Logistic (S-curve) GrowthtimePopulation (N)Exponential (unlimited resources)K (carrying capacity)Logistic (limited resources)Logistic growth slows as N approaches K; exponential growth never slows down

Exponential growth produces an ever-steepening J-curve with no limit, an unrealistic long-term model; logistic growth produces an S-curve that levels off at the carrying capacity K, as growth rate (K−N)/K shrinks to zero once resources are fully used.

Concept context

How organisms interact with abiotic factors and respond to stress, plus population attributes, growth models, and interspecific interactions such as predation, competition, and mutualism.

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