Gamete production occurs in the sexual phase or gametophyte generation of the cycle. Contents: Distribution of Ephedra Vegetative Features of Ephedra Anatomy of Ephedra Reproduction of Ephedra Embryogency of Ephedra Economic … The gametophytes (1n), microspores and megaspores, are reduced in size. The life cycle of a conifer will serve as our example of reproduction in gymnosperms. 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. Evolution of gnetophyta The gnetophytes potentially evolved way back in the Permian or Triassic Periods more than 200 million years ago. The last phylum, Gnetophyta, is a diverse group of plants that produce vessel elements in their wood. To know more about what are Gymnosperms, its characteristics, classification, examples and life cycle of gymnosperms, keep visiting BYJU’S website. ADVERTISEMENTS: In this article we will discuss about Ephedra. The gametophyte is the sexual phase in the life cycle of plants and algae. The maidenhair tree (Ginkgo biloba) makes up the only member but is closely related to conifers and cycads. The life cycle of Bryophytes is like all the other land plants (embryophytes) with alternation of generations. Conifers (Coniferophyta) Conifers are the dominant phylum of gymnosperms, with the most variety of species (Figure 2). The third genus, Ginkgo, has only one member, Ginkgo biloba, commonly called the ginkgo tree. They can be classified as Coniferophyta, Cycadophyta, Ginkgophyta, and Gnetophyta. Vegetative Features of Ephedra 3. However, the earliest definite fossils that have been found and assigned to the gnetophytes are from the Cretaceous Period … Embryogency 6. Life Cycle of a Conifer. All gymnosperms are heterosporous. 7 § Microsporocytes (microspore mother cells) undergo meiosis to produce 4 microspores 4. Distribution of Ephedra 2. Two of the three genera of ginkgophytes, Ginkgoites and Baiera, are extinct. In the life cycle of a conifer, the sporophyte (2n) phase is the longest phase. Ginkgophyte, any member of the division Ginkgophyta, a group of gymnospermous plants of particular interest to paleobotanists. After reading this article you will learn about: 1. Conifer Life Cycle. ... Gnetophyta are considered the closest group to angiosperms because they produce true xylem tissue. Anatomy 4. It gives rise to diploid sporophyte, which, however, contains twice the number of paired chromosomes. Gymnosperms are found in boreal and temperate forests. 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. This type of life cycle is known as alternation of generations. 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. Jhodlof, Harrison, Beentree, MPF, and RoRo/Wikimedia Common/CC BY 3.0. In the gymnosperm life cycle, plants alternate between a sexual phase and an asexual phase. Also Read: Alternation of Generations. The life cycle of a gymnosperm involves alternation of generations, with a dominant sporophyte in which reduced male and female gametophytes reside. Economic Importance. Spore to Gametophyte. 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. Reproduction 5. Ginkgophyta is one of four divisions of plants within the non-flowering plant group that produces seeds called gymnosperms. 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