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BIO NMDCAT Lamarckism
nmdcat.online July 14, 2026

A population of insects is exposed to a chemical insecticide. Over several generations, the population becomes highly resistant. How would Lamarck explain this phenomenon?

A. The insecticide killed the non-resistant insects, leaving only the resistant ones to breed.
B. The insects actively developed physiological resistance mechanisms during their lifetime to survive, passing this acquired resistance to their offspring.
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C. The insecticide caused random mutations in the gametes of the insects.
D. The insects learned to avoid eating plants sprayed with the chemical.

📝 Explanation

Lamarckism posits that the environmental stress (insecticide) induced an active, physiological adaptation in the individual insects, which was then directly inherited.

📖 Additional Information

  • The insecticide killed the non-resistant insects, leaving only the resistant ones to breed.
  • The insects actively developed physiological resistance mechanisms during their lifetime to survive, passing this acquired resistance to their offspring.
  • The insecticide caused random mutations in the gametes of the insects.
  • The insects learned to avoid eating plants sprayed with the chemical.

Lamarckism posits that the environmental stress (insecticide) induced an active, physiological adaptation in the individual insects, which was then directly inherited.

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