Origin And Phylogeny of Angiosperm
Angiosperm: Vascular Plant Where fruit and flower formation takes place and seen id covered within the fruit is called angiosperm. Such as Oryza sativa, Zea mays. Origin of Angiosperm: According to Bentham and hooker angiosperm originated from the evolution of Bennettitales order of gymnosperms flat. Flowering plant Originated from Bennettitales bi-sexual flower. The bi-sexual flowers are small and bear three distinct floral parts. First spirally arranged bracts. Secondly, the whorl of the microsporophyll is female parts, ovule. The Ranalis order might have been evolved by the gradual transformation of foliaceous bract into perianth, microsporophyll into a male part, and megasporophylls into a female part, spontaneously further developing into gynoecium.