Do seeds contain male gametophyte?
Unlike bryophyte and fern spores (which are haploid cells dependent on moisture for rapid development of gametophytes ), seeds contain a diploid embryo that will germinate into a sporophyte. Pollen grains are male gametophytes carried by wind, water, or a pollinator.
What is another name for the male gametophyte in seed plants?
Pollen grains are the male gametophytes in flowering plants. Inside the pollen grain, the microspore divides to form two cells, a tube cell and a cell that will act as the sperm.
What is the male gametophyte of gymnosperms?
Gymnosperms (and flowering plants as well) produce pollen as a package for the dispersal of sperm. Gymnosperms disperse pollen on wind currents. Pollen grains are male gametophytes.
What does a male gametophyte of a seed plant develops into?
The male gametophyte containing the generative cell splits into two sperm nuclei, one of which fuses with the egg, while the other degenerates. After fertilization of the egg, the diploid zygote is formed, which divides by mitosis to form the embryo. The scales of the cones are closed during development of the seed.
Which forms male gametophyte after germination?
The development of male and female gametophytes of seed plants (spermatophytes) takes place in micro- and megasporangia formed on modified leaves (sporophylls) in cones or in flowers. In contrast to most free-sporing plants, immature microgametophytes of seed plants are dispersed as desiccation-tolerant pollen.
What are male gametophytes?
In higher plants, the male and female gametophytes are comprised of male and female gametes, respectively. A mature male gametophyte in angiosperms is a pollen grain that comprises 3-celled structures. The male gametophyte develops mainly through two phases of growth, one pre-pollination, and one post-pollination.
Is pollen grain and male gametophyte same?
So, the pollen is an immature or partially developed male gametophyte. Similarly, the unicellular microspore produces male gametes and develops into mature microgametophyte by the process of mitotic cell division. Hence, the pollen grains are immature male gametophyte and partially developed male gametophyte.
Are seeds Sporophytes or gametophytes?
Unlike bryophyte and fern spores (which are haploid cells dependent on moisture for rapid development of gametophytes), seeds contain a diploid embryo that will germinate into a sporophyte.
Where is the male gametophyte in the life cycle of a seed plant?
In flowering plants, the gametophyte generation takes place in a flower, which forms on the mature sporophyte plant. Each male gametophyte is just a few cells inside a grain of pollen.
What does a gametophyte produce?
In the gametophyte phase, which is haploid (having a single set of chromosomes), male and female organs (gametangia) develop and produce eggs and sperm (gametes) through simple mitosis for sexual reproduction.
Where are male and female gametophytes found in seed plants?
The male and female gametophyte structures are present on separate male and female cones in gymnosperms, whereas in angiosperms, they are a part of the flower.
What is male gametophyte in flowering plants?
In flowering plants, the pollen grain is the male gametophyte and the embryo sac is the female gametoph yte. The male gametophyte completes its early development within the anther.