Science
Reproduction
प्रजनन
In this Class 10 Science topic from the “World of Living” chapter, students explore how organisms produce new individuals and why reproduction is essential for the continuation of life. They compare asexual and sexual reproduction, study reproductive processes in plants and humans, and understand puberty, the human reproductive system, fertilisation, menstruation, and basic reproductive health. The topic also introduces contraception and the role of responsible choices in preventing unwanted pregnancy and sexually transmitted infections.
Practice questions
Why does a farmer use cuttings of a good plant to maintain the same qualities?HardLevel 26Why may a potato piece without an eye fail to form a new plant?HardLevel 26How is formation of a new plant from Bryophyllum leaf different from seed reproduction?HardLevel 26Sexual reproduction needs more energy and time yet why is it useful for a species?HardLevel 26If pollen reaches the stigma but is not from the same species why may fertilisation not occur?HardLevel 26Why is a pollen tube necessary for fertilisation even after pollination?HardLevel 26Why can variation in offspring be lower in self pollination than in cross pollination?HardLevel 26If stamens are removed from a flower but pistil remains intact what is still possible in that flower?HardLevel 26After fertilisation ovule becomes seed and ovary becomes fruit. Why are seeds found inside the fruit?HardLevel 26If a flower has an ovary but its ovules are not healthy what will happen to seed formation?HardLevel 26Even after getting water why can seed germination stop if air is unavailable?HardLevel 26How is the location of testes outside the body in scrotum related to sperm formation?HardLevel 26If testes produce sperms but sperm ducts are blocked why will the chance of fertilisation decrease?HardLevel 26Why can the success of sperms decrease if fluid in semen is insufficient?HardLevel 26If the oviduct is blocked why can pregnancy be difficult even when ovaries are normal?HardLevel 26Fertilisation occurs in the oviduct but why does the embryo attach in the uterus?HardLevel 26If the uterine lining does not become thick enough what may happen to early embryo development?HardLevel 26How does nourishment reach the embryo through placenta without direct mixing of maternal and embryonic blood?HardLevel 26Why does the uterine lining form and break repeatedly during the menstrual cycle?HardLevel 26Why does menstrual bleeding stop when pregnancy occurs?HardLevel 26