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.
Is a pine branch haploid or diploid?
All pine trees and flowering plants also spend most of their time diploid, and only a short time haploid.
Which parts of the pine life cycle are haploid?
Cones: The reproductive structures of gymnosperms. Female cones are larger. Meiosis produces megaspores (haploid), which will develop into female gametophytes, which are retained in the female cone.
Where on a pine tree a gymnosperm would you find a developing seed?
Gymnosperms: seeds produced in the open on cone scales. Angiosperms: seeds enclosed within fruits. How many seeds are produced at the base of each pine seed cone scale?
Is a seed a sporophyte or 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.
Is the Nucellus haploid or diploid?
The ploidy level of the plant is diploid. Hence, the ploidy level of nucellus is 2n. MMC is a microspore mother cell, also known as meiocyte which undergoes meiotic division and produces female gametes.
What is the female gametophyte in pine?
The female and male inflorescence of the pine tree develop as cones on the sporophyte. 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. De male cone is in fact composed of numerous strobili.
Why is a pine tree called a sporophyte?
Sporophytes is a stage in Plant life cycle. Its a diploid stage in which egg and sperm fuse together. It has double set of chromosomes one from each parent. So Pine trees have both sporophylls on the same sporophyte.
What is the life cycle of pine tree?
Life Cycle of a Conifer
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.