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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 can the direction of natural selection change when useful traits change in an environment?If green insects survive birds better on green leaves, this is an example of which process?What is the main reason for not considering analogous organs as strong evidence of common ancestry?Bird wings and insect wings are similar in flying yet they are not homologous. What is the reason?Why is reproductive isolation important for speciation beyond mere distance?How does classification help in understanding evolutionary relationships but is not the only final proof?Why can it be wrong to call two organisms closely related only by external similarity?Why is evolution understood at the population level rather than at the individual level?What is the importance of limited resources in Darwin's natural selection?What is the cause-effect relation between adaptation and natural selection?How does studying fossils and homologous organs together strengthen understanding of evolution?A colour change in an organism will contribute to evolution only when which condition is fulfilled?If two populations live in different environments, why can different traits increase in them?Why can we not say that the human hand and a bird wing have the same function just because they are homologous?Why can a useful trait increase rapidly in a population only when it helps both survival and reproduction?Why should heredity and evolution be considered connected processes rather than completely separate ones?What is the most balanced scientific conclusion of this subtopic?If two hybrid tall pea plants are crossed, why can dwarf plants appear again?In a monohybrid cross, what does the 3:1 ratio in the second generation prove?If a pea plant appears dwarf, what conclusion about its trait information is correct?