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प्रश्न
Observe the following figure and explain the concept.
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उत्तर
- The figure depicts the concept proposed by 'Lamarck'. Lamarck proposed that the activities of organisms are responsible for their evolution.
- This French naturalist proposed that each animal or plant undergo some changes in its life span and those changes are transferred to the next generation and such changes occur in the next subsequent generations too.
- The giraffe's neck has grown too long as a result of 'acquired characters'. For several generations, they have been browsing on the leaves of tall plants by extending their neck.
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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 ______.
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:
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
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?
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?
Under the postulate of 'Inheritance of Acquired Characters', how are traits or modifications acquired during an organism's lifetime transmitted to its offspring?
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?
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?
For an acquired trait to be transmitted to the next generation, which of the following cell types would need to be altered?
A newborn rat in Weismann's experiment was born with a normal tail even though its parents' tails had been cut off. This outcome directly contradicts which postulate of Lamarckism?
