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
Which example correctly shows the difference between an inherited trait and an acquired trait?EasyLevel 21Which organisms can be more successful in natural selection?MediumLevel 21If birds eat more green insects than brown insects what result is possible over time?MediumLevel 21Why are fossils considered evidence of evolution?MediumLevel 21What do fossils found in deeper rock layers usually indicate?MediumLevel 21Why are the wings of a bird and an insect called analogous organs?MediumLevel 21What is the most important difference between homologous and analogous organs?MediumLevel 21Which statement correctly relates natural selection and variation?MediumLevel 21If a change occurs only in body cells and not in reproductive cells why will it not pass to the next generation?MediumLevel 21What is the correct relation between genes and chromosomes?EasyLevel 21Which statement shows that evolution explains both similarity and difference?MediumLevel 21Why is it more correct to see evolution as a branching tree rather than a straight ladder?MediumLevel 21What is the scientific meaning of similarity between humans and chimpanzees?MediumLevel 21Why can relying only on external appearance be wrong while deciding relationships among organisms?HardLevel 21If two organisms have organs with different functions but similar basic structure, what can these organs indicate?MediumLevel 21If two organs perform the same function of flying but have different origins, what type of organs are they?MediumLevel 21Why is comparison of living organisms with fossils useful in the study of evolution?MediumLevel 21Why can evolution not be explained only on the basis of acquired traits?MediumLevel 21If a variation in an organism does not help its survival or reproduction, what may happen to it under natural selection?MediumLevel 21In a small isolated group, some traits become more common only by chance. This situation is related to which evolutionary idea?MediumLevel 21