Ovule Structure and Embryo Sac — NEET Biology
📚 Practice ConceptThe pistil has three parts - the stigma, style and the ovary. Ovules are present in the ovary. The ovules have a stalk called funicle, protective integument(s), and an opening called micropyle. The central tissue is the nucellus in which the archesporium differentiates. A cell of the archesporium, the megaspore mother cell divides meiotically and one of the megaspores forms the embryo sac (the female gametophyte). The mature embryo sac is 7-celled and 8-nucleate. At the micropylar end is
Which of the following statements are correct regarding megasporogenesis and the development of the female gametophyte in angiosperms? S1: Megasporogenesis involves the meiotic division of a diploid megaspore mother cell (MMC), typically located in the micropylar region of the nucellus, to produce four haploid megaspores. S2: In most flowering plants, the functional megaspore, usually the one at the chalazal end, undergoes three sequential mitotic divisions without immediate cell wall formation to form an 8-nucleate embryo sac. S3: The mature embryo sac is 7-celled and 8-nucleate, comprising an egg apparatus at the chalazal end, three antipodals at the micropylar end, and a central cell with two polar nuclei. S4: The filiform apparatus, present at the micropylar tip of the synergids, plays a vital role in guiding the pollen tube into one of the synergids. S5: The nucellus, which surrounds the embryo sac, consists of cells that are primarily involved in photosynthesis to support embryo sac development.
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