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Subjects

Science

Evolution and speciation

जैविक विकास और प्रजाति-निर्माण

In this Class 10 Science topic from Heredity and Evolution, students explore how inherited variations accumulate over generations and contribute to the evolution of organisms. They learn how natural selection, environmental changes, and reproductive isolation can lead to the formation of new species, or speciation. The topic also connects fossils, similarities among organisms, and other evidence to the scientific understanding of evolutionary relationships and biodiversity.

Practice questions

What is the process of formation of a new species called?EasyLevel 19Why can isolation be important in speciation?EasyLevel 19Which factor can help in speciation?EasyLevel 20Who gave the idea of evolution based on natural selection?EasyLevel 21How can isolation help in speciation?EasyLevel 21How can geographical isolation help in speciation?MediumLevel 19Why is geographical distance alone not always enough for forming a new species?MediumLevel 19If two groups remain separated for a long time and cannot reproduce with each other, which process can this be linked to?MediumLevel 19How can genetic drift and natural selection both contribute to speciation?MediumLevel 19How can geographical isolation help in speciation?MediumLevel 20If a lizard population is divided into two groups by a river, what may happen over a long time?MediumLevel 20What is the main difference between natural selection and genetic drift?MediumLevel 20What is the relation between inherited traits and evolution?MediumLevel 20What do homologous organs indicate about evolution?MediumLevel 21How can geographical isolation contribute to speciation?MediumLevel 21Which situation can be considered an important step towards formation of a new species?MediumLevel 21Why is the usual non-inheritance of acquired traits important for understanding evolution?HardLevel 19How is genetic drift different from natural selection?HardLevel 19Why is the position of rock layers important when fossils are used as evidence of evolution?HardLevel 19Why do fossils not tell the whole story of evolution directly yet remain useful?HardLevel 19