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🔬 Biology  ·  Organisms and Populations  ·  NEET

Most invertebrates, fish, amphibians, and reptiles, whose body temperature varies with the environment, are best described as:

Answer: Conformers (poikilotherms/ectotherms).

  • A Regulators (homeotherms), maintaining constant temperature
  • B Conformers (poikilotherms/ectotherms)
  • C Migrants that move to avoid unfavorable conditions
  • D Mainly aestivators during the driest seasons

Correct answer: B. Conformers (poikilotherms/ectotherms)

Explanation: Conformers (poikilotherms or ectotherms) cannot regulate their internal temperature, which changes along with ambient environmental temperature.

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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