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
How can geographical isolation become a first step toward speciation?HardLevel 19What can happen if natural selection and genetic drift act differently in two separated groups?HardLevel 19Why is a long period of time necessary in natural selection and speciation?HardLevel 19What careful conclusion in evolution is obtained from examples of analogous organs?HardLevel 19If two populations of a species develop different colours in different environments, what process may this begin?HardLevel 20Geographical isolation can promote which process?HardLevel 21In human evolution, language and a large brain are more closely related to what?MediumLevel 21If two separated populations start interbreeding again, what may happen to speciation?HardLevel 21If natural selection and genetic drift act in different directions in two separated populations, what can be the long-term result?ExpertLevel 19How can genetic drift and natural selection together contribute to speciation?ExpertLevel 19How does geographical isolation help in speciation?HardLevel 21Why are homologous organs considered evidence for evolution?MediumLevel 21What do vestigial organs suggest about evolution?MediumLevel 21Development of different forms from a common ancestor in different environments shows what?MediumLevel 21