2.2. Pistil, Megasporangium and Embyosac

 The Pistil:

The gynoecium Arab pistol status female reproductive part of the flower. Distal is composed of the one or more carpels or megasporepylls which may be either free or apocarpous or fused syncarpous. A pistol main consists of one carpel, monocarpellary, two carpels bicarpellary, three carpels tricarpellary, pokhar pal status capillary and Pi carpels pentacarpellary and more than 5 carpels is called multicarpellary

Each still contains of three parts one is ovary and another one is style and another one is stigma


The megasporangium (ovule):


  • Megasporogenesis is a process of formation of applied megaspores from the megaspore mother cell
  • Departed megaspore mother cell undergo miotic division to produce ki AC Lloyd Bilaspur
  • Report applied megaspore single megaspore functional remains disappear the megaspore enlarged exercise
  • The nucleus of functional megaspore divide se mitotically to produce two nuclei these two nuclei undergo two sequential mitotic division and attend 8 nucleate stage
  • Two nuclei remains central region are polar nuclei
  • Three nuclei move towards micropyll side are egg apparatus
  • 3 nuclei Moto was the chala chal side are antipodal cells
  • The egg apparatus contains one excel and two synergids

Female gametophyte or embryo sac:



The embryo sac is the female gametophyte of the angiosperms which is normally a 7 cell structure
  • Female gametophyte are embryo sac contains the seven salad are eight nucleated stays in the embryo sac located at the narrow nucellus of oval
  • Jagah paratus to synergids and one Excel which is is situated towards the micropylar end of the embryo sac.
  • Listener cheats have special cellular signalling at the micropylar tip filiform apparatus
  • The central cell present in the central region of the process consists of two fused polar nuclei and one coming from the micropylar end and other coming from the chala chal end of the embryo sac
There is three antipodal cells towards the chalazal end

The nucleus of the functional megaspore divides to form the two nuclei which is moved toward the opposite poles and performing the two nuclear or nucleated embryo sac. It is followed by the two successive mitotic division to form 4 nucleated and 8 nucleated stages of embryo sac. The three successive nuclear divisions are not followed by the intermediate cell wall formation. After Eid nucleated stage cellone are formed. Shiksha prerak news and and 3 and organised into the cells three cells egg apparatus at the micropylar in the in the antipodals at the end these are applied. The remaining two nuclei at the polar ends of the polar nuclei which is moved to the centre of the embryo sac and fuse to form the diploid secondary nucleus at the Central cell. A typical angiosperm embryo sac at maturity do it nucleated is a 7 said the apparatus and antipodals are haploid and secondary nucleus is diploid

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2.2. Pistil, Megasporangium and Embyosac

 The Pistil: The gynoecium Arab pistol status female reproductive part of the flower. Distal is composed of the one or more carpels or megas...