alleryLamarck's explanation that an organ becomes strong or weak according to how much it is used is called the principle of:
AUse or disuse of organs
BSurvival of the fittest
CNatural selection
DGeographical isolation
Answer & Solution
Correct answer: A. Use or disuse of organs
1. Lamarck claimed morphological changes drive evolution.
2. He said activity or laziness of an organism changes its organs.
3. He named this the principle of use or disuse of organs.
4. Survival of the fittest is Darwin's idea, so it is ruled out.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 1 "Heredity and Evolution", p.17_
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