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Subjects

Science

Heredity and Evolution

आनुवंशिकता और विकास

This Class 10 Science topic from the chapter “World of Living” explains how traits are passed from parents to offspring through genes and chromosomes. Students explore Mendel’s experiments, dominant and recessive traits, inherited variation, and the basic idea of sex determination in humans. The topic also introduces evolution, showing how variations, natural selection, fossils, and similarities or differences among organisms help us understand the gradual development of life over generations.

Practice questions

Why are analogous organs not considered strong evidence of common ancestry?On what basis are the human arm and bat wing considered homologous?Bird wings and insect wings perform similar functions; yet why are they not homologous?Why can deciding evolutionary relationships only by external similarity be misleading?Why is it wrong to understand evolution as a ladder?What is the correct scientific meaning of similarity between humans and chimpanzees?Why is it wrong to call an organism backward in evolution just because it looks simple?What is the usual meaning of close branches in an evolutionary tree?Which example best shows the relation between homologous organs and evolution in different directions?If two populations develop different colours in different environments and remain isolated for a long time, what may happen later?In which situation can both natural selection and genetic drift change the structure of a population?A useful change occurs in an organism but it is not in reproductive cells. What will be its importance in evolution?Why can a population with very low variation be at greater risk when a disease suddenly spreads?Which statement gives the most correct balance between heredity and variation?Which option gives the most correct conditions needed for evolution?If two organisms have high genetic similarity, what can it mean in evolutionary terms?Why is the study of evolutionary relationships based not only on fossils but also on structure and genetic information?If a student says humans are the final step of evolution, what is the correct scientific correction?Two groups from a common ancestor live in different environments for a long time. What can be the main reason for increasing differences between them?What is the deepest scientific conclusion of the whole chapter?