16. Label the following on Figure 5 below: Antheridia, Archegonia, Adult Sporophyte,Zygote, Egg, Sorus, Gametophyte, Sporangium, Fertilization.MeiosisSpore (n)917 31Spore (n)Mature dehiscing(2n)with spores (n)Immaturesporangium(2n)LeafIndusium (2n)Germinatingspores(2ń)rhizoidsMaturegametophyteprothallus (n)1n2n(2n)-Sperm (n)Leaf of a youngsporophyte (2n)(n)prothallus (n)96(2n)Figure 5. Polystichum life cycle (drawn by Stephanie Preising, SCSU '20)Part B: PsilotumExamine the living Psilotum plant. Psilotum, is unique among living seedless vascular plantsbecause it lacks both roots and true leaves. Note the dichotomous branching pattern of thestems. Instead of roots, Psilotum has an underground stem, a rhizome, which bearsrhizoids for the absorption of water.Examine the Psilotum for the presence of sporangia, which are borne terminally on shortside branches. Psilotum is homosporous, producing only one type of spore. The sporesproduce bisexual gametophytes, which in turn produce both archegonia and antheridia onthe same gametophyte. (See text Figure 17-29, page 418.)Part C: EquisetumExamine the living Equisetum plant. The sporophyte differs from other fern allies in havingjointed and ribbed stems with small scale-like leaves arranged in whorls at the nodes.(See text Figure 17-37, page 424.)17. Where does photosynthesis take place in the Equisetum sporophyte?Examine a prepared slide of a longitudinal section of an Equisetum strobilus. The strobili ofEquisetum differ from those of Lycopodium and Selaginella in that Equisetum sporangia areborne on umbrellalike structures called sporangiophores, rather than on sporophylls. The

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16. Label the following on Figure 5 below: Antheridia, Archegonia, Adult Sporophyte, Zygote, Egg, Sorus, Gametophyte, Sporangium, Fertilization. Meiosis Spore (n) Spore (n) Mature dehiscing (2n) with spores (n) Immature sporangium (2n) Leaf Indusium (2) Germinating spores rhizoids- Mature gametophyte prothallus (n) 1n 2n (2n) -Sperm (n) Leaf of a young sporophyte (2n) (n) (2n)

16. Label the following on Figure 5 below: Antheridia, Archegonia, Adult Sporophyte, Zygote, Egg, Sorus, Gametophyte, Sporangium, Fertilization. Meiosis Spore (n) Spore (n) Mature dehiscing (2n) with spores (n) Immature sporangium (2n) Leaf Indusium (2) Germinating spores rhizoids- Mature gametophyte prothallus (n) 1n 2n (2n) -Sperm (n) Leaf of a young sporophyte (2n) (n) (2n)

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter25: Seedless Plants

Section: Chapter Questions

Problem 7RQ: How does a haplontic plant population maintain genetic diversity? Zygotes are produced by random...

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Figure 25.24 Which of the following statements about the fern life cycle is false? Sporangia produce haploid spores. The sporophyte grows from a gametophyte The sporophyte is diploid and the gametophyte is haploid. Sporangia form on the underside of the gametophyte.
Figure 23.28 Which of the following statements about the Laminaria life cycle is false? In zoospores form in the sporangia. The sporophyte is the 2n plant. The gametophyte is diploid. Both the gametophyte and sporophyte stages are multicellular.
Place the following events in the correct order: 1. pollen tube grows into ovule 2. insect lands on flower to drink nectar 3. embryo develops within the seed 4. fertilization occurs 5. pollen carried by insect contacts stigma (a) 2, 5, 1, 4, 3 (b) 1, 4, 2, 5, 3 (c) 3, 2, 5, 1, 4 (d) 5, 1, 3, 4, 2 (e) 2, 5, 4, 3, 1
4) Draw the moss gametophyte and sporophyte, and label the following structures: gametophyte male plant female plant foliage (bladelike structures) rhizoids sporophyte (stalk & capsule)
Label the diagram which features an illustration of a portion of the sporophyte of Selaginella with strobili, and a photomicrograph of the longitudinal section of a mature strobilus. Indicate whether each of the structure you identified is haploid (n) or diploid (2n)
Sporangia produce gametes via meiosis produce spores via meiosis produce gametes via mitosis Selected produce spores via mitosis
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…
Identification: 1. In the moss gametophyte, this structure contains the haploid female gamete. 2. It refers to the production of two different types of spores (megaspore and microspore). 3. The embryos of corn and other grass seeds are partial enclosed in a protective sheath called?
This is a longitudinal section of a Marchantia sp. gametophyte body. Label the following structures: A.) thallus, B.) gemma cup, C.) gemmae.
Label the following as A, B, C, D Foot/ Seta/ Capsule Sporangium/ Spore mother cells
Give the function of rhizoids. Is the individual germinating from the zygospore haploid or diploid? Label the sporangia, sporangiophore and rhizoids in Figure 4.2a and the zygospore in Figure 4.2b.
9. Label the sporangia, indusium, leaf, and spores in Figure 4 below. 01 Figure 4. Cyrtomium leaf c.s., sorus l.s. 10. Explain the mechanism of spore dispersal in ferns with sori 11. In what way is this mechanical method of spore dispersal similar to that in the bryophytes? Photo by Carolyn Alling Most ferns produce only one kind of spore and are therefore homosporous. Upon germination, the spore, the first cell of the gametophytic generation, gives rise to a heart shaped, bisexual gametophyte, called a prothallus. 12. What type of nuclear division produces the many celled gametophyte from a spore? Examine the fern gametophytes under the dissecting scope. Note the many rhizoids emerging from the lower, or ventral, surface. Among the rhizoids you will find antheridia, some of which may contain sperm cells. Nearer the notch of the "heart" you will find the archegonia. In order to visualize their shape in three dimensions, you will have to focus up and down on the archegonia. Examine the…