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प्रश्न
Write short notes based upon the information known to you.
Lamarckism
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उत्तर
- Lamarck gave the principle of 'use or disuse of organs. He proposed that the reason behind evolution was the changes in the morphological activities of the organism.
- For example, a giraffe has a long neck because it used to browse on leaves of tall plants by extending their neck for several generations; the shoulders of an ironsmith are strong due to repetitive hammering movements; the wings of an ostrich and emu are weak because they are not used for flying; and the legs of birds and swans are used for swimming because they live in water.
- These characters are termed as acquired characters, which are transferred from one generation to another.
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संबंधित प्रश्न
Survival of fittest : Darwin : : Acquired characters : ..............................
Mention the two principles through which Lamarck explained his ideas.
Briefly discuss Lamarckian Theory of Inheritance citing an appropriate example.
Explain the occurrence of vestigial organs on the basis of Lamarck's theory of use and disuse.
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following:
Give the common name and the scientific name of the insect involved in this phenomenon.
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following:
Briefly mention why the changes shown in the two figures appeared.
Given alongside are two figures (A and B) showing a phenomenon that was first observed in Manchester before and after the year 1850.
Answer the following:
The following phenomenon provides a classical explanation of a scientific theory given by a certain scientist.
(i) Name and explain the said theory.
(ii) Give the name of the scientist who gave this theory.
Explain Lamarck’s Principle.
The ‘use and disuse theory’ was proposed by ______.
The use and disuse theory of organs’ was postulated by Charles Darwin.
The degenerated wing of a kiwi is an acquired character. Why is it an acquired character?
Observe the following figure and explain the concept.
The theory proposed by Lamarck is ______.
