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प्रश्न
List any three drawbacks of Darwinism.
Mention any four drawbacks of Darwinism.
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उत्तर
The following are the drawbacks of Darwinism:
- Darwin could not explain the origin of variations or how they arise. He failed to distinguish between environmental and hereditary variations.
- Darwin did not differentiate between somatic and germinal variations. He mistakenly considered all variations as heritable.
- Darwin’s theory lacked clarity on how new characters arose or how the “arrival of the fittest” occurred. He didn’t explain how advantageous traits were inherited.
- Darwin believed in gradual evolution, but he didn’t recognize intermediate forms. He also couldn’t explain species extinction or vestigial organs.
- Darwin couldn’t explain neutral traits or hybrid sterility. He also overlooked the hindrance caused by over-specialized organs like tusks and antlers.
Notes
Students should refer to the answer according to their question and preferred marks.
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संबंधित प्रश्न
Explain Darwinian theory of evolution with the help of one suitable example.
Objection to Darwin's theory of natural selection.
Explain the phenomenon that is well represented by Darwin's finches other than natural selection.
What is "fitness of an individual" according to Darwin?
The largest unit in which gene flow is possible is :
(1) Organism
(2) Population
(3) Species
(4) Genes
Answer the following question.
How did Charles Darwin express 'fitness'?
Identify the two organisms which are now extinct and are studied from their fossils.
Differences between organisms in a species are described as variations. Which of the following would you describe as a continuous variation?
If the fossil of an organism is found in the deeper layers of earth, then we can predict that
Which of the following sequences fits into the organic evolution theory proposed by Charles Darwin and Alfred Wallace?
Theory of natural selection dwells on:
Species occurring in the different geographical areas are called as ______.
Mention Darwin's observations made on finches during his visit of Galapagos Islands. Write the explanation given by Darwin on his observations.
Distinguish between directional, stabilizing and disruptive selection.
Differentiate between Lamarck's Theory and Darwin's Theory.
Match the name of the scientist in Column I with the name of the theory in Column II.
| Column (I) | Column (II) | ||
|---|---|---|---|
| i. | August Weisman | a. | Theory of origin of species |
| ii. | Hugo de Vries | b. | Theory of chemical evolution |
| iii. | Charles Darwin | c. | Theory of continuity of germplasm |
| iv. | Oparin Haldane | d. | Mutation theory |
Choose the correct option.
