When they cannot reproduce with each other, they are said to be isolated reproductively.When they are separated by a distance or geographical barriers they are said to be isolated geographically.Therefore, the individuals from one species cannot reproduce with individuals from other species.Their reproductive ability and period is also different. The requirements of food and habitat, is specific for each species. Every species survives in specific geographical conditions.Geographical and reproductive isolation of organisms gradually leads to speciation. But the true wise and intelligent man arose around 50,000 years ago.ī. This journey of human evolution began 7 crore years ago.Later, the human evolution took place by changes in the brain volume, the ability to walk upright, excessive use of hand for manipulations.
The monkey like ancestors gave rise to two evolutionary links to apes and human like animals. The body and brain both increased in volume forming first ape like animals.The tails of these monkey-like creatures started vanishing very gradually around 4 crore years ago.Ancestors of monkey-like animals were Lemur like animals which evolved during this time period.Due to change in climate the forest cover also declined rapidly. The evolution and diversity of mammals started during this time. In such conditions, dinosaurs became extinct. Approximately around 7 crore years back the ice age began on the earth.Human evolution began approximately 7 crore years ago. Read the following statements and justify same in your own words with the help of suituble examples.Ī. Maharashtra State Board Class 10 Science Solutions Part 2 Chapter 1 Heredity and Evolution Balbharti Maharashtra State Board Class 10 Science Solutions Part 2 Chapter 1 Heredity and Evolution Notes, Textbook Exercise Important Questions and Answers.
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