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प्रश्न
Explain the occurrence of vestigial organs on the basis of Lamarck's theory of use and disuse.
उत्तर
Organs which are found in reduced or rudimentary condition and do not perform any function in the possessor are called vestigial organs or non-functional organs. They help in understanding the history of evolution and continuity of life.
- Wisdom teeth: They are the last molars which appear last at the age of 17-20 years.
- Vermiform appendix: It projects from the blind end of the caecum and is a functionless organ in humans. It is helpful in herbivorous mammals.
- Pinna: It is the lobe-like part of the external ear which humans cannot move as in other mammals. As it is poorly developed, it is a vestigial organ.
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संबंधित प्रश्न
Write short notes based upon the information known to you.
Lamarckism
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.
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.
Theory of evolution : Darwin : : ____________ : Lamarck
What is inheritance of acquired characters?
The theory proposed by Lamarck is ______.
