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P-2 Heredity and Evolution — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10ScienceP-2 Heredity and Evolution3 Marks
Question
Darwin's theory of natural selection.
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Answer

i. Explanation for Darwin's theory of natural selection:
i. Darwin's theory of natural selection is based on the concept of survival of the fittest.
ii. Organisms can reproduce prolifically.
iii. Under limited resources, organisms compete with each other in a life-threatening manner for their survival.
iv. According to this theory, only those organisms survive which show modifications for winning the competition. The selected organisms then give rise to new species with their specific set of characters.
ii. Objections raised against Darwin's theory of natural selection:
a. Natural selection is not the only factor responsible for evolution.
b. In his theory, Darwin did not explain the inheritance of useful and useless modifications.
c. No explanation regarding slow and abrupt changes was provided in this theory.

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