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BIO NMDCAT Lamarckism
nmdcat.online July 14, 2026

Which of the following statements best describes the concept of “orthogenesis” in relation to Lamarck’s “Internal Vital Force”?

A. Evolution proceeds in a random, undirected manner.
B. Evolution is driven along a definite, non-random path by internal factors.
✓
C. Evolution is strictly driven by external environmental selective pressures.
D. Evolution is entirely stagnant without genetic mutations.

📝 Explanation

Orthogenesis (straight-line evolution) is conceptually linked to Lamarck's internal vital force, suggesting organisms have an innate drive to evolve in a specific, progressive direction.

📖 Additional Information

  • Evolution proceeds in a random, undirected manner.
  • Evolution is driven along a definite, non-random path by internal factors.
  • Evolution is strictly driven by external environmental selective pressures.
  • Evolution is entirely stagnant without genetic mutations.

Orthogenesis (straight-line evolution) is conceptually linked to Lamarck's internal vital force, suggesting organisms have an innate drive to evolve in a specific, progressive direction.

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