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प्रश्न
a) Explain in brief - Lamarck’s principle of ‘use or disuse of organs’.
b) Give two examples.
c) What are ‘acquired characters’?
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उत्तर
a) The morphological changes occurring in living organisms are responsible for evolution and the reason behind those morphological changes is activities or laziness of that organism. This concept is called as principle of ‘use or disuse of organs’.
b) The neck of giraffe has become too long due to browsing on leaves of tall plants by extending their neck for several generations. Wings of birds like ostrich and emu have become weak due to no use.
c) The living organism can transfer the characters which it has acquired, to the next generation are called acquired characters.
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संबंधित प्रश्न
Write short notes based upon the information known to you.
Lamarckism
The first scientist who proposed his theory for evolution was ______.
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.
Theory of evolution : Darwin : : ____________ : Lamarck
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?
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 degenerated wing of a kiwi is an acquired character. Why is it an acquired character?
Observe the following figure and explain the concept.
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?
