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nmdcat.online July 14, 2026

A scientist observes that when a certain plant is grown in high-salinity soil, it develops thick, fleshy leaves. When its seeds are planted in normal soil, the offspring grow normal, thin leaves. This observation:

A. Supports Lamarck's theory of inheritance of acquired characters.
B. Refutes Lamarck's theory of inheritance of acquired characters.
✓
C. Proves that salinity causes permanent genetic mutations.
D. Shows that somatic mutations are highly heritable.

📝 Explanation

Since the offspring of the salt-stressed plant reverted to normal thin leaves when grown in normal soil, the acquired trait (thick leaves) was not inherited, refuting Lamarck's theory.

📖 Additional Information

  • Supports Lamarck's theory of inheritance of acquired characters.
  • Refutes Lamarck's theory of inheritance of acquired characters.
  • Proves that salinity causes permanent genetic mutations.
  • Shows that somatic mutations are highly heritable.

Since the offspring of the salt-stressed plant reverted to normal thin leaves when grown in normal soil, the acquired trait (thick leaves) was not inherited, refuting Lamarck's theory.

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