WebGenerally, only one megaspore is functional and develops into the female gametophyte or the embryo sac. This is known as monosporic development. ... The four haploid nuclei of … WebThe megaspore mother cell undergoes meiosis to give rise to 4 haploid cells. Three haploid cells degenerate and 1 survives to become the embryo sac. The embryo sac enlarges in …
CBSE Free NCERT Solution of 12th biology Sexual ... - SaralStudy
Megaspores, also called macrospores, are a type of spore that is present in heterosporous plants. These plants have two spore types, megaspores and microspores. Generally speaking, the megaspore, or large spore, germinates into a female gametophyte, which produces egg cells. These are … See more In gymnosperms and flowering plants, the megaspore is produced inside the nucellus of the ovule. During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to … See more • Megasporangium • Microspore • Spore • Double fertilization See more After megasporogenesis, the megaspore develops into the female gametophyte (the embryo sac) in a process called megagametogenesis. … See more Web21 Oct 2024 · The functional megaspore undergoes three rounds of nuclear mitosis to form a syncytial female gametophyte with eight nuclei. Subsequently, the syncytial female … la fitness tacoma 6th ave
Gymnosperms: THE GYMNOSPERM DIVISIONS: Gnetophytes: FORM AND FUNCTION …
WebIn plant development: Preparatory events. …sporangia; the larger spore (megaspore) gives rise to the female gametophyte, the smaller spore (microspore) to the male. This condition is referred to as heterospory. … WebReproductive structures and function. ... One megaspore greatly enlarges and undergoes mitotic divisions, producing multiple nuclei that are not surrounded by walls. After 500 to 1,000 nuclei are produced, cell walls begin to form, converting the megagametophyte (or female gametophyte) into a cellular structure. At the upper end, egg-bearing ... Web14 Jul 2024 · 60. (c): Megaspore is the initial cell or beginning of female gametophyte or embryo sac. The nucleus of megaspore undergoes divisions and give rise to embryo sac … la fitness tacoma 6th