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Development of Female Gametophyte or Embryo Sac

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Estimated time: 2 minutes
  • Formation of Embryo Sac
  • Cellular Organisation of Embryo Sac
CBSE: Class 12
Maharashtra State Board: Class 12
CISCE: Class 12

Key Points: Development of Female Gametophyte or Embryo Sac

  • The female gametophyte (embryo sac) develops from the functional megaspore through mitotic divisions.
  • The nucleus divides to form 8 nuclei, arranged with four at each pole, and one from each pole moves to the centre as polar nuclei.
  • At the micropylar end, three nuclei form the egg apparatus (one egg cell and two synergids), which help in guiding the pollen tube.
  • At the chalazal end, three nuclei form the antipodal cells, while the two polar nuclei fuse to form a diploid secondary nucleus.
  • The mature embryo sac is monosporic, 7-celled and 8-nucleated (Polygonum type), which is the most common in angiosperms.

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