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According to Lamarck, the long neck of the giraffe developed because its ancestors constantly stretched to reach high leaves. Which principle of Lamarckism does this best illustrate?
AUse and disuse of organs
BNatural selection
CStruggle for existence
DOverproduction
Answer & Solution
Correct answer: A. Use and disuse of organs
1. Lamarck's use and disuse theory says an organ used constantly develops well, while an unused organ degenerates.
2. Constant stretching of the neck and forelimbs is constant use, leading to their development.
3. Natural selection and struggle for existence are Darwin's ideas, not Lamarck's, which rules out options B and C.
4. So this illustrates use and disuse of organs, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 19 Origin and Evolution of Life "Lamarckism", p.284_
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