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🔬 Biology  ·  Organisms and Populations  ·  NEET

Allen’s rule states mammals in cold climates have?

Answer: Shorter extremities.

  • A Shorter extremities
  • B the longer body limbs
  • C only bigger ear size
  • D a set of long tails

Correct answer: A. Shorter extremities

Explanation: Allen’s rule: colder regions favour shorter extremities.

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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