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
Only a few organisms suddenly survive in a population and form the next generation. Which process becomes more likely?MediumLevel 20If two organisms have organs with similar basic structure, what may this indicate?MediumLevel 20Why do analogous organs not provide strong evidence of a common ancestor?MediumLevel 20Which example shows an acquired trait rather than natural selection?MediumLevel 20Why are offspring formed by sexual reproduction not exactly identical to their parents?MediumLevel 20How can some variation arise even in asexual reproduction?MediumLevel 20Which statement correctly relates genes and traits?EasyLevel 20If an organism has a useful variation but cannot reproduce, why will that variation not increase in the population?MediumLevel 20In which situation is formation of a new species most likely?MediumLevel 20If two organisms look different but can reproduce with each other and produce fertile offspring, what are they generally considered?MediumLevel 20Which statement correctly defines a fossil?MediumLevel 20What does greater similarity in genetic material of two organisms indicate?MediumLevel 20Greater similarity between humans and chimpanzees supports which idea?MediumLevel 20If organisms with a useful trait in a group produce more offspring what will happen over time?MediumLevel 20What is the best reason for studying heredity and evolution together?MediumLevel 20If a plant shows the tall trait, what can its genetic combination be?MediumLevel 21If a pea plant appears dwarf, what type of genetic information must it have?EasyLevel 21What is the correct relation between the chromosome number in a human body cell and that in a reproductive cell?EasyLevel 21Why is it necessary for reproductive cells to have half the chromosome number?MediumLevel 21A boy develops strong muscles through exercise. Why will this trait not pass directly to his children?MediumLevel 21