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
When can self-pollination be useful for a plant?ExpertLevel 27Why does cross-pollination increase the possibility of new traits in offspring?ExpertLevel 27If the stigma is not sticky, what difficulty may occur in an insect-pollinated flower?ExpertLevel 27Why is it important that the male gamete reaches the egg through the pollen tube?ExpertLevel 27Why is seed formation not guaranteed even after pollination?ExpertLevel 27What can be the most correct reason for formation of a many-seeded fruit?ExpertLevel 27What is the scientific reason for producing a very large number of pollen grains in wind-pollinated plants?ExpertLevel 27How does nectar in insect-pollinated flowers increase pollination?ExpertLevel 27How is the external position of testes linked with sperm production?ExpertLevel 27Why is there no immediate direct effect on male hormones after cutting the vas deferens?ExpertLevel 27Why is fluid from accessory glands important for the success of sperms?ExpertLevel 27If the fallopian tube is blocked, why can pregnancy be difficult even if ovulation is normal?ExpertLevel 27Thickening and breakdown of the uterine lining are linked with which cycle?ExpertLevel 27Why can development not continue if embryo implantation in the uterus is unsuccessful?ExpertLevel 27Why can the placenta be called a selective exchange surface between mother and embryo?ExpertLevel 27Why does menstruation occur if fertilization does not happen after ovulation?ExpertLevel 27Deepening of voice during adolescence is more closely related to what?ExpertLevel 27What is the functional reason for the size difference between male and female gametes?ExpertLevel 27How can a barrier contraceptive method help prevent both pregnancy and disease?ExpertLevel 27What can be the main biological effect of hormone-based contraceptive pills?ExpertLevel 27