Reproduction
Biology · प्रजनन · 13 facts
Reproduction: process of producing offspring; ensures species survival
Asexual: single parent; binary fission(amoeba), budding(hydra,yeast), spore(fungi)
Vegetative propagation: stem cutting, grafting, layering in plants
Sexual: two parents(male+female); gamete fusion(fertilization)
Male gamete: sperm; Female gamete: ovum(egg); fusion=zygote
In flowers: stamen(male-pollen) and pistil(female-ovule)
Pollination: transfer of pollen to stigma; self or cross
Human gestation period: ~9 months(~280 days)
Placenta: connects mother and foetus; provides nutrients+O2
Twins: identical(one zygote splits) or fraternal(two separate eggs)
Puberty: adolescence changes; boys 13-14yrs, girls 10-12yrs
Test tube baby(IVF): fertilization outside body then embryo implanted
DNA in chromosomes carries genetic information from parents to offspring