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🔬 Biology  ·  Organisms and Populations  ·  NEET

A large tree casting shade and suppressing the growth of a small plant beneath it, without itself being affected, illustrates:

Answer: Amensalism.

  • A Mutualism
  • B Commensalism
  • C Amensalism
  • D Parasitism

Correct answer: C. Amensalism

Explanation: Amensalism is an interaction where one species (the small plant) is harmed or inhibited while the other species (the large tree) remains unaffected.

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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