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Subjects

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 are both reproduction and variation important for the long-term existence of a species?If all offspring produced by asexual reproduction are almost similar, what will be the biggest problem in a suddenly changing environment?Why is it necessary for gametes to contain half the chromosome number in sexual reproduction?Why is nuclear division necessary before cytoplasmic division in binary fission?In which situation can production of many offspring from one cell by multiple fission be more useful?Why does a bud in Hydra grow before separating from the parent?What is a deeper difference between fragmentation and regeneration?How can Rhizopus spores survive even in unfavorable conditions?Why can plants produced by vegetative propagation be more sensitive to the same disease?Why is vegetative propagation more useful than seed reproduction in seedless plants?What is the importance of nutrient medium in tissue culture?Why can variation be low in self-pollination even though seed formation may occur?How can cross-pollination increase the chance of adaptation in plants?If pollen reaches the stigma but does not germinate, why will fertilization stop?Why is it wrong to consider pollination and fertilization as the same process?If an ovary has five ovules and four are fertilized, how many seeds will generally form?Why may wind-pollinated flowers have less showy petals and more pollen grains?Why are sticky pollen grains useful in insect-pollinated flowers?The need to keep testes slightly cooler than body temperature is linked with what?Why does the chance of fertilization decrease in a male if the vas deferens is blocked?