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