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 reproductive isolation be considered more important than mere distance in the formation of a new species?ExpertLevel 19Why is classification considered supportive evidence of evolution but not the final proof by itself?ExpertLevel 19Why is it risky to call two externally similar organs homologous based only on outer appearance?ExpertLevel 19Why is it more correct to understand evolution at the population level rather than at the individual level?ExpertLevel 19In Darwin's theory of natural selection, what process is intensified by limited resources?MediumLevel 19What is the most correct reasoning for calling adaptation a result of natural selection?MediumLevel 19If the environment changes, why can a previously useful trait become less useful later?MediumLevel 19How do fossils and homologous organs complement each other as evidence of evolution?MediumLevel 19If two species have similar chemical hereditary material what can it indicate about evolution?MediumLevel 19Why can it be wrong to treat evolution as a straight ladder-like sequence?MediumLevel 19Why should language of superiority be avoided while studying evolutionary relation between humans and other organisms?MediumLevel 19If an organism is very successful in its environment is it necessary that it is the final stage of evolution?MediumLevel 19Why are both survival and reproduction necessary for a useful trait to increase rapidly in a population?MediumLevel 19What is the most important link connecting heredity and evolution?MediumLevel 19What is the most mature scientific conclusion of this subtopic?ExpertLevel 19If all plants in the first generation of pure tall and pure dwarf pea plants are tall, what is the correct conclusion about the dwarf trait?MediumLevel 20What is the main reason for some dwarf plants appearing when two hybrid tall plants are crossed?MediumLevel 20If a pea plant is dwarf, what is the most correct genetic conclusion about it?EasyLevel 20What is understood when new trait combinations appear in a dihybrid cross?MediumLevel 20If a trait in offspring does not look like the mother but looks like the father, what can be the correct reason?MediumLevel 20