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Difficulty: HardLamarck's Theory of Evolution

Match each Lamarckian evolutionary postulate or related historical concept on the left with its corresponding descriptive statement or experimental critique on the right.

  • Principle of Use and DisuseAn organ enlarged or modified through frequent exertion during an individual's lifetime develops further, while lack of use leads to its degeneration.
  • Inheritance of Acquired CharacteristicsPhysiological and morphological changes developed by an organism during its lifetime are directly passed on to subsequent generations.
  • Environmental Need (Besoin)Environmental shifts create new demands that induce altered habits and physical adjustments within an organism's lifetime.
  • Germplasm Theory CritiqueExperimental proof that somatic alterations in parents do not modify germ cells or influence inherited traits in progeny.

Answer

Principle of Use and Disuse matches the statement regarding organ hypertrophy through exertion and atrophy through disuse. Inheritance of Acquired Characteristics matches the statement regarding somatic modifications being passed to progeny. Environmental Need (Besoin) matches the statement about environmental shifts creating new demands that drive behavioral and structural adaptations. Germplasm Theory Critique matches the experimental proof that somatic changes do not affect germ cells.
Each concept correctly aligns with its historical definition or scientific critique. The principle of use and disuse concerns organ development through exertion or atrophy through neglect. Inheritance of acquired characteristics describes the transfer of somatic traits to progeny. Environmental need explains how changing surroundings prompt adaptive responses. Germplasm theory refutes Lamarckism by demonstrating the separation of somatic and reproductive cells.

Step-by-Step Solution

1
Analyze the core postulates of Lamarckism and the primary historical counter-evidence.
Identify the definitions of use and disuse, acquired traits, environmental needs, and Weismann's germplasm theory.
Clear differentiation between Lamarck's mechanisms and their experimental refutation is necessary to pair each concept accurately.
2
Match 'Principle of Use and Disuse' to its mechanism.
Pairs with the description detailing organ enlargement from frequent use and degeneration from disuse.
Lamarck proposed that physical exertion directly alters organ structure within an individual's lifetime.
3
Match 'Inheritance of Acquired Characteristics' to its definition.
Pairs with the statement that lifespan modifications are transmitted to subsequent generations.
This postulate erroneously assumed somatic changes could be inherited.
4
Match 'Environmental Need (Besoin)' and 'Germplasm Theory Critique' to their remaining descriptions.
Environmental Need pairs with environmental shifts creating new demands, and Germplasm Theory Critique pairs with the distinction between somatic and germ cells.
Lamarck emphasized environmental stimulus for adaptation, while Weismann proved germ cells are isolated from somatic changes.

Key Concept

Lamarckian Evolutionary Principles and Germplasm Counter-Evidence
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Topics

Lamarck's Theory of Evolution

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