Question

Write short notes on Lamarckism based upon the information known to you.

Answer 1

Appendix. Vestigial Organs are certain body parts which are a sign of evolution of human beings from their ancestral structures.

These are organs which might have been present in the ancestors of the species, and are not of much use now to the evolved species.

Appendix is one such organ, as has been noted by Charles Darwin.

Appendix is supposed to be the cecum which was present in the ancestors of human beings, but now is shrunken and not valid in any way. 

Answer 2

Answer:

Lamarckism: 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, 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.

Explanation: