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Question
Explain Lamarck’s Principle.
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Solution
- 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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RELATED QUESTIONS
Write a short note based on the information known to you.
Lamarckism
Survival of fittest : Darwin : : Acquired characters : ..............................
The first scientist who proposed his theory for evolution was ______.
Mention the two principles through which Lamarck explained his ideas.
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:
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
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 characters developed by the animals during their life time, in response to the environmental changes are called ______.
Observe the following figure and explain the concept.
According to the 'Use and Disuse of Organs' principle, what is the effect of continuous disuse of an organ?
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?
According to the scientific conclusion that rejected Lamarckism, modifications caused by the environment or the 'use and disuse' of organs only affect which cells?
