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प्रश्न
Explain Lamarck’s Principle.
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उत्तर
- Lamarckism is the theory of inheritance of acquired characters from one generation to another, given by Jean-Baptiste Lamarck.
- It states that the morphological changes occurring in living organisms are responsible for evolution. This concept was based on the principle of use and disuse of organs.
- Morphological changes may occur gradually, either due to specific activities or the laziness of a particular organism.
- For e.g. Browsing on leaves of tall plants caused the neck of the giraffe to become long; frequent hammering movements cause the shoulders of ironsmith to become strong; inactivity caused weakening of the wings of birds like emu; legs of swans and ducks have become useful for swimming due to living in water; due to burrowing habits, snakes have lost their legs; etc.
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संबंधित प्रश्न
Write a short note based on the information known to you.
Lamarckism
The first scientist who proposed his theory for evolution was ______.
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
What is inheritance of acquired characters?
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?
The theory proposed by Lamarck is ______.
