BIO NMDCAT Lamarckism

nmdcat.online July 14, 2026

The concept of “Use and Disuse” implies that:

A. Organs that are used more become stronger and larger, while unused organs degenerate.

✓

B. Organs that are used more will eventually wear out and disappear.

C. Only organs that are unused are passed down to offspring.

D. Genetic mutations occur only in organs that are actively used.

📝 Explanation

Lamarck's third postulate states that active use of an organ strengthens and enlarges it, while continuous disuse leads to its structural decay and eventual loss.

📖 Additional Information

Organs that are used more become stronger and larger, while unused organs degenerate.
Organs that are used more will eventually wear out and disappear.
Only organs that are unused are passed down to offspring.
Genetic mutations occur only in organs that are actively used.

Lamarck's third postulate states that active use of an organ strengthens and enlarges it, while continuous disuse leads to its structural decay and eventual loss.

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