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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
Survival of fittest : Darwin : : 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:
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?
The characters developed by the animals during their life time, in response to the environmental changes are called ______.
The degenerated wing of a kiwi is an acquired character. Why is it an acquired character?
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?
Which environmental change did Lamarck cite as driving the evolution of the horse?
How were webbed feet in swimming birds explained under Lamarck's evidences?
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?
