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Here's ur question...
Give three main differences between the theories of LAMARCK and DARWIN....
Class 10th...✌
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Answers
→ Lamarck's theory held that species underwent changes in response to changes in their environment. One notable example quoted by him was the case as it might exist with respect to Giraffes.
Lamarck contended that as trees began to grow taller, giraffes responded to the change by growing longer necks so that they could continue to feed.
His second contention was that this change was permanent for as long as the new environmental conditions continued to apply.
In other words, nature chose the best possible solution and, organisms (species), responded accordingly.
→ Darwin's theory was one of natural selection and survival of the fittest. As the environment underwent changes, the species affected by these changes underwent changes in response to changes in the environment. So essentially, a mutation happened that caused a giraffe's ancestors to grow longer necks, and because those ancestors had better access to food than ones with shorter necks, they reproduced more, outnumbering and eventually replacing the short-neck ones.
★ Lamarckism:
This theory states that there is an internal vital force in all organisms.It considers that new needs or desire produce new structures and change habits of the organism.According to this theory if an organ is constantly used it would be better developed whereas disuse of organ results in its degeneration.
★ Darwinism
This theroy does not believe in the internal vital force.It contends that needs and/ or desires do not form part of Darwin’s natural selection theory.An organ can develop further or degenerate only due to continuous variations.
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Q) WHAT IS DIFFERENCE BETWEEN LARLMARCK AND DARWIN??
LAMARCK :-Lamarck's theory held that species underwent changes in response to changes in their environment. One notable example quoted by him was the case as it might exist with respect to Giraffes.
Lamarck contended that as trees began to grow taller, giraffes responded to the change by growing longer necks so that they could continue to feed.
His second contention was that this change was permanent for as long as the new environmental conditions continued to apply.
Lamarckism:
✯This theory states that there is an internal vital force in all organisms.
✯ It considers that new needs or desire produce new structures and change habits of the organism.
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DARWIN:-Darwin's theory was one of natural and survival of the fittest. As the environment underwent changes, the species affected by these changes underwent changes in response to changes in the environment. So essentially, a mutation happened that caused a giraffe's ancestors to grow longer necks, and because those ancestors had better access to food than ones with shorter necks, they reproduced more, outnumbering and eventually replacing the short-neck ones.
Darwinism:-
✯ This theroy does not believe in the internal vital force.
✯It contends that needs and/ or desires do not form part of Darwin’s natural selection theory.
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