Assertion: female gametophyte | /r/Synonym | the embryo sac
Facets:
value: sometimes
type: TEMPORAL
value: in flowering plants
type: LOCATION
value: in angiosperms
type: LOCATION
Source sentences:
text: The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms.
text: In the second phase of female gametophyte development, the surviving haploid megaspore undergoes mitosis without complete cell division to produce an eight-nucleate, seven-cell female gametophyte, the embryo sac, illustrated below.
text: Gametogenesis is a fundamental and critical step in plant life cycles , which contributes to the formation of the male gametophyte (pollen) in male organ anther and female gametophyte (embryo sac) in female organ ovule.
text: In flowering plants, the female gametophyte (sometimes referred to as the embryo sac) has been reduced to just eight cells inside the ovule.
text: The female gametophyte, the megagametophyte, that participates in double fertilization in angiosperms which is haploid is called the embryo sac.
text: Endosperm is formed when the two sperm nuclei inside a pollen grain reach the interior of a female gametophyte (sometimes called the embryo sac).
text: A number of parts of the reproductive process are common to both angiosperms and gymnosperms: (1) they produce seeds at maturity; (2) the megasporangium, unlike that of heterosporous seedless plants, is covered by one or two cellular layers called integuments and is termed an ovule; (3) there is a minute passageway, or micropyle, through the integuments; (4) the ovule matures as a seed; (5) only one megasporocyte is present and undergoes meiosis in the megasporangium to produce four megaspores, only one of which usually is functional; (6) the megaspore is never discharged from its megasporangium and ovule; (7) one female gametophyte is produced within each megasporangium and ovule; (8) the microspores begin their development into male gametophytes while still enclosed in the microsporangia; (9) as they mature, the male gametophytes, which are contained within the microspore wall and are termed pollen grains, develop a tube that conveys sperm to the egg cell; (10) union of sperm and egg and development of an embryonic sporophyte from the zygote occur within the female gametophyte (sometimes called the “embryo sac”), which is covered by the remains of the megasporangium and by integuments; (11) as the embryo develops, the ovule matures as a seed.
text: After megasporogenesis, the megaspore develops into the female gametophyte (the embryo sac) in a process called megagametogenesis.
text: In angiosperms the male gametophyte is the pollen grain, and the female gametophyte the embryo sac.
text: Three megaspores (nearest the micropyle) degenerate; only one enlarges, and then it undergoes divisions to form the eight-nucleate, seven-celled female gametophyte (“embryo sac”).