Also Read: Alternation of Generations. Vegetative Features of Ephedra 3. This type of life cycle is known as alternation of generations. It gives rise to diploid sporophyte, which, however, contains twice the number of paired chromosomes. Life Cycle of a Conifer. A haploid gametophyte cell contains a fixed number of unpaired chromosomes. Gamete production occurs in the sexual phase or gametophyte generation of the cycle. They can be classified as Coniferophyta, Cycadophyta, Ginkgophyta, and Gnetophyta. The third genus, Ginkgo, has only one member, Ginkgo biloba, commonly called the ginkgo tree. Anatomy 4. Reproduction 5. Gymnosperms are found in boreal and temperate forests. Conifers (Coniferophyta) Conifers are the dominant phylum of gymnosperms, with the most variety of species (Figure 2). Conifer Life Cycle. Jhodlof, Harrison, Beentree, MPF, and RoRo/Wikimedia Common/CC BY 3.0. Distribution of Ephedra 2. Two of the three genera of ginkgophytes, Ginkgoites and Baiera, are extinct. Ginkgophyte, any member of the division Ginkgophyta, a group of gymnospermous plants of particular interest to paleobotanists. The life cycle of a gymnosperm involves alternation of generations, with a dominant sporophyte in which reduced male and female gametophytes reside. Economic Importance. Contents: Distribution of Ephedra Vegetative Features of Ephedra Anatomy of Ephedra Reproduction of Ephedra Embryogency of Ephedra Economic … ... Gnetophyta are considered the closest group to angiosperms because they produce true xylem tissue. The maidenhair tree (Ginkgo biloba) makes up the only member but is closely related to conifers and cycads. To know more about what are Gymnosperms, its characteristics, classification, examples and life cycle of gymnosperms, keep visiting BYJU’S website. The gametophyte is the sexual phase in the life cycle of plants and algae. The last phylum, Gnetophyta, is a diverse group of plants that produce vessel elements in their wood. Evolution of gnetophyta The gnetophytes potentially evolved way back in the Permian or Triassic Periods more than 200 million years ago. However, the earliest definite fossils that have been found and assigned to the gnetophytes are from the Cretaceous Period … Ginkgophyta is one of four divisions of plants within the non-flowering plant group that produces seeds called gymnosperms. A gametophyte (/ É¡ ə ˈ m iː t oʊ f aɪ t /) is one of the two alternating phases in the life cycle of plants and algae.It is a haploid multicellular organism that develops from a haploid spore that has one set of chromosomes. The life cycle of a hortwort is fairly complex (and quite different from your life cycle), so we will need to break it down a bit. The gametophytes (1n), microspores and megaspores, are reduced in size. Spore to Gametophyte. After reading this article you will learn about: 1. The life cycle of Bryophytes is like all the other land plants (embryophytes) with alternation of generations. Embryogency 6. Each microspore develops into a pollen grain § Pollen grain is the male gametophyte in the pine life cycle § Each pollen grain has two wings and is carried by the wind to the seed cone where pollination occurs Development of Female Gametophyte 5. 7 § Microsporocytes (microspore mother cells) undergo meiosis to produce 4 microspores 4. This phase may take more than one year between pollination and fertilization while the pollen tube grows towards the megasporocyte (2n), which undergoes meiosis into megaspores. In the life cycle of a conifer, the sporophyte (2n) phase is the longest phase. In the gymnosperm life cycle, plants alternate between a sexual phase and an asexual phase. The life cycle of a conifer will serve as our example of reproduction in gymnosperms. ADVERTISEMENTS: In this article we will discuss about Ephedra. All gymnosperms are heterosporous. And RoRo/Wikimedia Common/CC BY 3.0 diploid sporophyte, which, however, contains twice the number of chromosomes! 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