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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.
APPEARS IN
संबंधित प्रश्न
Survival of fittest : Darwin : : Acquired characters : ..............................
a) Explain in brief - Lamarck’s principle of ‘use or disuse of organs’.
b) Give two examples.
c) What are ‘acquired characters’?
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:
Briefly mention why the changes shown in the two figures appeared.
Theory of evolution : Darwin : : ____________ : Lamarck
Explain Lamarck’s Principle.
Observe the picture and answer the following questions.
- The given picture indicates which principle?
- Explain that principle in your language.
- What is the meaning of acquired characteristics?
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?
In which work and year was Lamarck's theory of evolution published?
According to the postulate on the 'Formation of New Organs', a new organ develops in response to which factor?
According to the 'Use and Disuse of Organs' principle, what is the effect of continuous disuse of an organ?
Which environmental change did Lamarck cite as driving the evolution of the horse?
In the evolution of the horse, the shift from being flat-footed to running on hooves corresponds to which specific change?
How were webbed feet in swimming birds explained under Lamarck's evidences?
August Weismann dealt the greatest blow to Lamarckism through which theory?
