The micropylar (distal) end of the ovule is adjacent to the egg cell and to the two synergistic cells in the seven-celled embryo sac, while the chalazal (proximal) end of the ovule is adjacent to the three antipodal cells (AP). The central cell (CC) of homo-diploid (2n) occupies most of the embryo sac, and includes a large central vacuole. All the cells within the embryo sac are strongly polarised and have distinct morphologies.
\n\n\n
\n
The precise migration and positioning of the nuclei at the eight-nucleate FG5 stage marks the distinction in their cell-fate specification between those nuclei. The two most distal nuclei form the potential synergids (SC) at the micropylar pole. The more distal nucleus of the pair from the remaining two nuclei will form the future egg cell, while the more central nucleus will become one of the central cell's two polar nuclei. The centremost nucleus of the four nuclei from the chalazal pole will constitute the central cell's other polar nucleus. The above nucleus migrates to the micropylar pole and is situated near the first polar nucleus as the embryo sac is cellularized to form the seven-cell embryo sac. After cellularization, the polar nuclei fuse to form the central homo-diploid nucleus of cells, and at the time of fertilisation the antipodal cells will degenerate.
\n
\n"},"comment":{"@type":"Comment","text":"This structure plays an essential role in the movement of the pollen into embryosac."},"encodingFormat":"text/markdown","learningResourceType":"Practice problem","suggestedAnswer":[],"text":"Explain the development of female gametophyte in angiosperms. Illustrate the answer with suitable diagrams."},"name":"Quiz on Sexual Reproduction in Flowering Plants","typicalAgeRange":"10-17","url":"https://www.embibe.com/questions/Explain-the-development-of-female-gametophyte-in-angiosperms.-Illustrate-the-answer-with-suitable-diagrams./EM8642996"}
Embibe Experts Solutions for Exercise 1: Punjab Board-2019
Author:Embibe Experts
Embibe Experts Biology Solutions for Exercise - Embibe Experts Solutions for Exercise 1: Punjab Board-2019
Attempt the practice questions from Exercise 1: Punjab Board-2019 with hints and solutions to strengthen your understanding. EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR BIOLOGY solutions are prepared by Experienced Embibe Experts.
Questions from Embibe Experts Solutions for Exercise 1: Punjab Board-2019 with Hints & Solutions