1. What is the ploidy (chromosomal condition) of the dominant plant body of Fern, Pine tree and Gumamela? 2. What are the spore bearing structures of Fern, Pine tree and Gumamela?
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1. What is the ploidy (chromosomal condition) of the dominant plant body of Fern, Pine tree and Gumamela?
2. What are the spore bearing structures of Fern, Pine tree and Gumamela?
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- How does a haplontic plant population maintain genetic diversity? Zygotes are produced by random fusion Gametes are created through meiosis Diploid spores undergo independent assortment during mitosis The zygote undergoes meiosis to generate a haploid sporophyte.1. What parts of a fern are diploid? 2. In ferns, where does the switch from diploid to haploid occur?What is the ploidy ( chromosomal condition) of the dominant plant body of Fern, Pine tree and Gumamela?
- 8. Place the following labels on the figure below: gamete, spore, sporophyte, gametophyte ΜΕIOSIS MITOSIS Haploid cells Diploid plant Diploid Haploid Haploid plant cell MITOSIS MITOSIS FERTILIZATION Compare and contrast the plant life cycles in the four major plant groups by filling in the table below. Determine if the life stage (gametophyte or sporophyte) is dependent, independent or dominant and place the appropriate term in each empty box in the table. Gametophyte (N) Sporophyte (2N) Bryophyte Seedless, vascular Gymno/Angiosperms17: What is the specific name given to this plant's tri-lobed sporangium?4) Draw the moss gametophyte and sporophyte, and label the following structures: gametophyte male plant female plant foliage (bladelike structures) rhizoids sporophyte (stalk & capsule)
- 10. Is the egg cell produced by meiosis or mitosis within an archegonium? Explain Obtain a prepared slide containing mature sporophytes and, using the low power lens of the microscope, find a complete sporophyte. 11. Is the sporophyte haploid or diploid?. Note that the sporophyte is attached to the gametophyte by a large foot. This structure grows through the base of the venter into the storage tissue of the archegonial head. 12. What is the function of the foot? 13. Is the sporophyte an "independent" or "dependent" organism? Explain The sporophyte also consists of a stalk, or seta, and a capsule, or sporangium (see text Figure 16-8, page 371). Numerous spores and elongated elaters are enclosed by the sterile jacket layer of the capsule. The elaters have spirally arranged, hygroscopic (moisture absorbing) wall thickenings that are sensitive to very slight changes in humidity. By twisting with changes in humidity, they aid in spore dispersal (see text Figure 16-12, page 375). Note the…16. Label the following on Figure 5 below: Antheridia, Archegonia, Adult Sporophyte, Zygote, Egg, Sorus, Gametophyte, Sporangium, Fertilization. Meiosis Spore (n) 917 31 Spore (n) Mature dehiscing (2n) with spores (n) Immature sporangium (2n) Leaf Indusium (2n) Germinating spores (2ń) rhizoids Mature gametophyte prothallus (n) 1n 2n (2n) -Sperm (n) Leaf of a young sporophyte (2n) (n) prothallus (n) 96 (2n) Figure 5. Polystichum life cycle (drawn by Stephanie Preising, SCSU '20) Part B: Psilotum Examine the living Psilotum plant. Psilotum, is unique among living seedless vascular plants because it lacks both roots and true leaves. Note the dichotomous branching pattern of the stems. Instead of roots, Psilotum has an underground stem, a rhizome, which bears rhizoids for the absorption of water. Examine the Psilotum for the presence of sporangia, which are borne terminally on short side branches. Psilotum is homosporous, producing only one type of spore. The spores produce bisexual…or lds P e t CO ea pre SC ctu of it h lu fru 0 2 > Regular 3 WW Where does meiosis take place in mosses? How do moss leaves differ from the leaves of vascular plants? Where, in mosses, are zygotes and embryos formed? What parts of a fern are diploid? Where, specifically, are fern antheridia located? 4 www 11 In Marchantia, what is the function of archegoniophores and antheridiophores? I In ferns, where does the switch from diploid to haploid occur? 5 a 6
- 2.There are 10 flowers in plant of crotalaria, in each microsporangium there are 30 microspore mother cells,how many pollen grains are formed from that plant(A) 4,000 (B) 10,000(C) 24000 (D) 48,000Which of the following traits characterizes gym nosperms? The plants carry exposed seeds on modified leaves Reproductive structures are located in a flower After fertilization, the ovary thickens and forms a fruit The gametophyte is the longest phase of the life cycle.Figure 24.14 Which of the following statements is true? A dikaryotic ascus that forms in the ascocarp undergoes karyogamy, meiosis, and mitosis to form eight ascospores. A diploid ascus that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A haploid zygote that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A dikaryotic ascus that forms in the ascocarp undergoes plasmogamy, meiosis, and mitosis to form eight ascospores.