Inside the ovule the megasporocyte undergoes meiosis, producing four haploid cells. One of these cells survive as a megaspore. The megaspore goes through mitotic divisions and forms a small female gametophyte, in which two or three archegonia are present, each with one egg cell.
Where does meiosis occur in a plant?
In flowering plants, meiosis occurs in megaspore mother cells (megasporocytes) within the ovules of ovaries, and in microspore mother cells (microsporocytes) within the anthers of stamens.
What is the life cycle of pine tree?
Pine trees are conifers (cone bearing) and carry both male and female sporophylls on the same mature sporophyte. Therefore, they are monoecious plants. Like all gymnosperms, pines are heterosporous, generating two different types of spores: male microspores and female megaspores.
What specific cells of pine undergo meiosis?
The cones bear scale-like male or female organs, called microsporophylls and megasporophylls, respectively. In pines, the microsporophyll has two microsporangia, sac-like structures filled with many diploid microspore mother cells, which undergo meiosis to produce haploid microspores.
Where does meiosis and mitosis occur in plants?
Mitosis occurs in gametophytes to produce gametes. Meiosis occurs in sporophytes to produce spores. Mitosis occurs in gametophytes to produce gametes; meiosis occurs in sporophytes to produce spores; and the gametophyte is within the flower of angiosperms.
Where does meiosis occur in the cell?
Meiosis occurs in the primordial germ cells, cells specified for sexual reproduction and separate from the body’s normal somatic cells. In preparation for meiosis, a germ cell goes through interphase, during which the entire cell (including the genetic material contained in the nucleus) undergoes replication.
Which part of the pine life cycle is the sporophyte?
Stage 1: Male cones (pollen cones) and female cones (ovuliferous cones) are formed on the adult tree or the spore-bearing plant (sporophyte). Stage 2: Several male cones are formed in a cluster beneath a new shoot.
Which part of the pine life cycle represents the Microgametophyte?
Microspores germinate within the sporophyte tissue and become pollen grains. The microgametophyte is contained within the tough, protective coat of the pollen grain.
Do conifers have seeds?
The seeds of a conifer are winged seeds. When they are released by the cone, they will float on the wind until they reach the ground where they will germinate and grow. There are some non-flowering plants that don’t produce seeds. Instead, they use spores to reproduce.
Where does mitosis occur in pine life cycle?
Within the megasporangium, a megaspore mother cell (2n) undergoes meiosis to produce four megaspores (n). Three die and one remains, developing by mitosis into the megagametophyte. The megagametophyte produces two archegonia, each with an egg. This trajectory occurs through the center of the diagram.
Where on a pine tree would you find a developing seed?
Pine trees reproduce by producing seeds. Unlike deciduous trees, which produce seeds that are surrounded by fruit, pine seeds are located on scales of structures called cones (pine cones). Pine trees possess both male and female reproductive structures, or cones. Both male and female cones are on the same tree.
Where does the embryo develop in pine trees?
The embryo is protected inside the cone by a tough seed coat, which is surrounded by a papery wing case. Later the scales open up and the seeds are blown away by the wind. Under favorable conditions the seed germinates and grows into a new pine tree.
Does meiosis occur only in plants?
It takes two rounds of division to produce four cells, each with only one copy of each chromosome (haploid). Complete answer: Meiosis is a process that happens in all animals and plants. … Meiosis creates gametes directly in mammals.
What is meiosis and where does it occur in plants and animals?
Meiosis produces haploid gametes (ova or sperm) that contain one set of 23 chromosomes. … Meiosis occurs in all sexually-reproducing single-celled and multicellular organisms (which are all eukaryotes), including animals, plants and fungi. It is an essential process for oogenesis and spermatogenesis.
Where does meiosis occur in mushroom?
Meiosis occurs in the cells of the mushroom cap and produce haploid spores which complete the lifecycle.