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प्रश्न
Write a short note based on 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 acquired characters and are transferred from one generation to another.
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संबंधित प्रश्न
Survival of fittest : Darwin : : Acquired characters : ..............................
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.
Theory of evolution : Darwin : : ____________ : Lamarck
The ‘use and disuse theory’ was proposed by ______.
The characters developed by the animals during their life time, in response to the environmental changes are called ______.
The use and disuse theory of organs’ was postulated by Charles Darwin.
The theory proposed by Lamarck is ______.
Observe the figure given below and answer the questions that follow:
- What is the figure depicting?
- What was the reason that the giraffe stretched their neck and forelimbs?
- What is the name of the theory that is being depicted in the figure?
- Who explained the theory?
- What is the conclusion of this theory?
According to the postulate on the 'Formation of New Organs', a new organ develops in response to which factor?
Under the postulate of 'Inheritance of Acquired Characters', how are traits or modifications acquired during an organism's lifetime transmitted to its offspring?
Which environmental change did Lamarck cite as driving the evolution of the horse?
August Weismann dealt the greatest blow to Lamarckism through which theory?
For an acquired trait to be transmitted to the next generation, which of the following cell types would need to be altered?
A newborn rat in Weismann's experiment was born with a normal tail even though its parents' tails had been cut off. This outcome directly contradicts which postulate of Lamarckism?
