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Question
Write short notes based upon the information known to you.
Lamarckism
Solution
- Lamarck gave the principle of 'use or disuse of organs’. He proposed that the reason behind evolution was the changes in the morphological activities of the organism.
- For example: giraffe has a long neck because it used to browse on leaves of tall plants by extending their neck for several generations, the shoulders of iron smith are strong due to repetitive hammering movements, wings of ostrich and emu are weak because they are not used for flying, legs of birds and swan are used for swimming because they live in water.
- These characters are termed as acquired characters which are transferred from one generation to another.
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RELATED QUESTIONS
Survival of fittest : Darwin : : Acquired characters : ..............................
a) Explain in brief - Lamarck’s principle of ‘use or disuse of organs’.
b) Give two examples.
c) What are ‘acquired characters’?
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.
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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.
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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.
The theory proposed by Lamarck is ______.
Observe the figure given below and answer the questions that follow:
- What is the figure depicting?
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- What is the name of the theory that is being depicted in the figure?
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- What is the conclusion of this theory?
