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 can a crop produced by vegetative propagation have a higher risk of disease spread?ExpertLevel 26In which situation will vegetative propagation prove more useful than reproduction by seeds?ExpertLevel 26Why may a potato piece without an eye fail to produce a new plant?ExpertLevel 26Why is a seed not needed for plant formation from a Bryophyllum leaf?ExpertLevel 26Why is fusion of gametes in sexual reproduction more important than just increasing numbers?ExpertLevel 26Why can offspring from self pollination be less varied than those from cross pollination?ExpertLevel 26What can be the most suitable reason for fertilisation failing even after pollination?ExpertLevel 26If pollen grains reach the stigma of a flower of a wrong species why will seeds usually not form?ExpertLevel 26When can seed formation still be possible after removing stamens from a flower?ExpertLevel 26Why do seeds remain inside the fruit after fertilisation?ExpertLevel 26If the ovule lacks a female gamete why will seed formation not occur even after pollination?ExpertLevel 26Why can seed development stop without air even if water is available for germination?ExpertLevel 26Why are testes located outside the body in the scrotum?ExpertLevel 26If the sperm duct is blocked why will fertilisation be difficult even when testes are normal?ExpertLevel 26How can deficiency of fluid in semen affect the function of sperms?ExpertLevel 26If the ovary produces ovum normally but the oviduct is blocked why will pregnancy be hindered?ExpertLevel 26In humans fertilisation occurs in the oviduct yet why is preparation of the uterus necessary?ExpertLevel 26If the embryo cannot attach properly to the uterine wall which need will be affected first?ExpertLevel 26Why is it incomplete to call placenta only a nourishing structure?ExpertLevel 26How does placenta exchange materials without direct mixing of mother and embryo blood being necessary?ExpertLevel 26