The Video lecture from Kingdom Plantae (F.Sc. First Year Biology) covers the evolutionary changes occurred on seeds which made them suitable to survive in tough and dry conditions. these changes include the development of heterospory, development of integument around megasporangium, development of embryo sac and pollen tubes etc. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.