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 insect wings and bird wings called analogous organs?MediumLevel 21How are rock layers used to estimate the age of fossils?MediumLevel 21What can a sequence of fossils show about evolution?MediumLevel 21In which condition is fossil formation more likely?MediumLevel 21Why should evolution be understood as a branching tree rather than a straight ladder?MediumLevel 21What is the most suitable evolutionary meaning of similarity between humans and chimpanzees?MediumLevel 21What is the main reason cauliflower, cabbage, and broccoli developed from wild cabbage?MediumLevel 21What is the main difference between artificial selection and natural selection?MediumLevel 21On an island, different food sources lead to different beak adaptations in birds. Which process can this show?HardLevel 21What can be inferred from greater DNA similarity between organisms?MediumLevel 21What does it suggest when two branches are very close in an evolutionary tree?MediumLevel 21How is the evolution of a complex organ like the eye correctly explained?MediumLevel 21Organs of different origin developing for a similar function are linked with which evolutionary process?MediumLevel 21If all offspring look the same in phenotype but may have different genotypes, which idea is important?MediumLevel 21If an organism has two different factors for a trait, what is it called?EasyLevel 21If two carrier parents have a child for a recessive disorder, what is the theoretical chance of an affected child?MediumLevel 21A pedigree chart is most helpful in understanding what?EasyLevel 21A trait useful in one environment may not be useful in another. What is the reason?MediumLevel 21Why is variation called the raw material of evolution?MediumLevel 21