Question

Ancestors of giraffe were considered to be the size of a deer. They grew their neck and limbs due to overuse of these parts. Which theory proposes this idea?

• A. Theory of chemical evolution
• B. Lamarck's theory of use and disuse of organs
• C. Theory of natural selection
• D. Mutation theory

Answer 1

The correct option is B Lamarck's theory of use and disuse of organs

Due to competition for food and the occurrence of droughts, grass and plants depleted. So giraffes used to stretch their neck and limbs inorder to reach the leaves of taller trees. This continued for generations and hence their neck and limbs grew longer. According to Lamarck's theory of use and disuse of organs, these acquired characters were passed on to the next generations.