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Question
a) Explain in brief - Lamarck’s principle of ‘use or disuse of organs’.
b) Give two examples.
c) What are ‘acquired characters’?
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Solution
a) The morphological changes occurring in living organisms are responsible for evolution and the reason behind those morphological changes is activities or laziness of that organism. This concept is called as principle of ‘use or disuse of organs’.
b) The neck of giraffe has become too long due to browsing on leaves of tall plants by extending their neck for several generations. Wings of birds like ostrich and emu have become weak due to no use.
c) The living organism can transfer the characters which it has acquired, to the next generation are called acquired characters.
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