Life Cycle of a Bryophyte Look at Samples at Corresponding Stations 1A, 1B, 2A, 2B and 3

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Life Cycle of a Bryophyte Look at samples at corresponding stations 1A, 1B, 2A, 2B and 3. Fill in the following blanks and answer the questions in the lab handout Stage 2A ARCHAEGONIUM (egg) Ploidy = ____ Fertilization Stage 2B ZYGOTE Ploidy = ____ (forms on the gametophyte) Stage 1 ANTHERIDIUM Division = ____ (sperm) Ploidy = ____ Stage 3 GAMETOPHYTE Ploidy = n Multicellular (Y/N)? SPOROPHYTE SPORES Ploidy = ____ Ploidy = ____ Multicellular (Y/N)? Life Cycle of a Seedless Vascular Plant Look at samples at corresponding stations 1, 2, 3, and 4 Fill in the following blanks and answer the questions in the lab handout Stage 1b Stage 2 Division = meiosis SPORES Stage 1a sporangia Ploidy =__ Sori (clusters of Stage 2 sporangia on underside) ARCHAEGONIUM Stage 3 (egg) Ploidy =__ close up of sori (big black dots) SPOROPHYTE ANTHERIDIUM Stage 4 (sperm) Ploidy =2n Ploidy =__ (small black dots) Multicellular (Y/N)? GAMETOPHYTE (aka prothallus) ZYGOTE Ploidy =__ Ploidy =__ Sporophyte grows Multicellular (Y/N)? directly on the prothallus Life Cycle of a Gymnosperm Look at samples at corresponding stations 1, 2A, 2B, 3A, 3B, 4A and 4B Fill in the following blanks and answer the questions in the lab handout Stage 3A Stage 4A Microsporangium Division = ____ Stage 2A with microspores Ploidy =__ Pollen (sperm contained within) Longitudinal section of male cone Male cones with MALE GAMETOPHYTE microsporangia Stage 2B Stage 3B Ploidy =__ Stage 1 Megasporangium Division = ____ archaegonium Stage with megaspores egg 4B Female cones with Ploidy =__ microsporangia Longitudinal section of female cone megasporangium FEMALE GAMETOPHYTE Ploidy =__ SPOROPHYTE Seed Division = ____ Fertilization Ploidy =2n disperses ZYGOTE Ploidy =__ Life Cycle of an Angiosperm Look at samples at corresponding stations 1, 2, 3, 4 and 5 Fill in the following blanks and answer the questions in the lab handout Stage 2 microsporangium (aka pollen sac) Division = ____ Stage 4 microspore Ploidy =__ anther Cross section of anther (sperm contained within) Stage 1 Stage 2 MALE GAMETOPHYTE (aka pollen) Ploidy =__ ovary Stage 5 megasporangium (aka ovule) Division = ____ SPOROPHYTE Stage 3 megaspore (contained within the megasproangium) Ploidy = 2n Cross section of ovary Ploidy =__ FEMALE GAMETOPHYTE (aka embryo sac) Ploidy =__ Multicellular (Y/N)? ZYGOTE Ploidy =__ .

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Topic: Microsporogenesis and Microgemetogenesis B.Sc. Botany (Hons.) II Paper: IV Group: B Dr
1 Topic: Microsporogenesis and Microgemetogenesis B.Sc. Botany (Hons.) II Paper: IV Group: B Dr. Sanjeev Kumar Vidyarthi Department of Botany Dr. L.K.V.D. College, Tajpur Microsporogenesis and Microgametogenesis Microsporogenesis Microspores i.e., the pollen grains are developed inside microsporangia. The microsporangia are developed inside the corners of the 4-lobed anther. Young anthers are more or less oblong in shape in section and made up of homogeneous mass of meristematic cells without intercellular space with further development, the anther becomes 4-lobed. The outer layer of anther is called epidermis. Below the epidermis, at each corner, some cells become differentiated from others by their dense protoplasm- archesporium or archesporial cells. Each archesporial cell then divides mitotically and forms an outer primary parietal cell and an inner primary sporogenous cell. The outer primary parietal cells form primary parietal cell layer at each corner. Below the parietal cell layer, the primary sporogenous cells remain in groups i.e., the sporogenous tissue. The cells of primary parietal layer then divide both periclinally and anticlinally and form multilayered antheridial wall. The innermost layer of antheridial wall, which remains in close contact with the sporogenous tissue, functions as nutritive layer, called tapetum. The primary sporogenous cells either directly function as spore mother cells or divide mitotically into a number of cells which function as spore mother cells. The spore mother cell undergoes meiotic division and gives rise to 4 microspores arranged tetrahedrally. Structure of Microspores Dr. Sanjeev Kumar Vidyarthi, Dept. of Botany, Dr. L.K.V.D. College, Tajpur 2 Microspore i.e., the pollen grain is the first cell of the male gametophyte, which contains only one haploid nucleus.
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AP® BIOLOGY 2009 SCORING GUIDELINES (Form B) Question 2 Discuss the patterns of sexual reproduction in plants. Compare and contrast reproduction in nonvascular plants with that in flowering plants. Include the following topics in your discussion: (a) alternation of generations (b) mechanisms that bring female and male gametes together (c) mechanisms that disperse offspring to new locations Four points per part. Student must write about all three parts for full credit. Within each part it is possible to get points for comparing and contrasting. Also, specific points are available from details provided about nonvascular and flowering plants. Discuss the patterns of sexual reproduction in plants (4 points maximum): (a) Alternation of generations (4 points maximum): Topic Description (1 point each) Alternating generations Haploid stage and diploid stage. Gametophyte Haploid-producing gametes. Dominant in nonvascular plants. Double fertilization in flowering plants. Gametangia; archegonia and antheridia in nonvascular plants. Sporophyte Diploid-producing spores. Heterosporous in flowering plants. Flowering plants produce seeds; nonvascular plants do not. Flowering plants produce flower structures. Sporangia (megasporangia and microsporangia). Dominant in flowering plants. (b) Mechanisms that bring female and male gametes together (4 points maximum): Nonvascular Plants (1 point each) Flowering Plants (1 point each) Aquatic—requires water for motile sperm Terrestrial—pollination by wind, water, or animal Micropyle in ovule for pollen tube to enter Pollen tube to carry sperm nuclei Self- or cross-pollination Antheridia produce sperm Gametophytes; no antheridia or archegonia Archegonia produce egg Ovules produce female gametophytes/gametes Pollen: male gametophyte that produces gametes © 2009 The College Board. All rights reserved. Visit the College Board on the Web: www.collegeboard.com.
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Heterospory: the Most Iterative Key Innovation in the Evolutionary History of the Plant Kingdom
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Journal of the Torrey Botanical Society 134(3), 2007, pp. 335–343 Microsporogenesis and male gametogenesis in Jatropha curcas L. (Euphorbiaceae)1 Huanfang F. Liu South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China, and Graduate School of Chinese Academy of Sciences, Beijing, 100039, China Bruce K. Kirchoff University of North Carolina at Greensboro, Department of Biology, 312 Eberhart, P.O. Box 26170, Greensboro, NC 27402-6170 Guojiang J. Wu and Jingping P. Liao2 South China Botanical Garden, Chinese Academy of Sciences, Key Laboratory of Digital Botanical Garden in Guangdong, Guangzhou, 510650, China LIU, H. F. (South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China, and Graduate School of Chinese Academy of Sciences, Beijing, 100039, China), B. K. KIRCHOFF (University of North Carolina at Greensboro, Department of Biology, 312 Eberhart, P.O. Box 26170, Greensboro, NC 27402-6170), G. J. WU, AND J. P. LIAO (South China Botanical Garden, Chinese Academy of Sciences, Key Laboratory of Digital Botanical Garden in Guangdong, Guangzhou, 510650, China). Microsporogenesis and male gametogenesis in Jatropha curcas L. (Euphorbiaceae). J. Torrey Bot. Soc. 134: 335–343. 2007.— Microsporogenesis and male gametogenesis of Jatropha curcas L. (Euphorbiaceae) was studied in order to provide additional data on this poorly studied family. Male flowers of J. curcas have ten stamens, which each bear four microsporangia. The development of the anther wall is of the dicotyledonous type, and is composed of an epidermis, endothecium, middle layer(s) and glandular tapetum. The cytokinesis following meiosis is simultaneous, producing tetrahedral tetrads. Mature pollen grains are two-celled at anthesis, with a spindle shaped generative cell.
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Plant Evolution and Diversity B. Importance of Plants C. Where Do Plants Fit, Evolutionarily? What Are the Defining Traits of Pl
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Great Basin Naturalist Memoirs Volume 9 A Utah Flora Article 6 1-1-1987 Division Lycopodiophyta Stanley L. Welsh Monte L. Bean Life Science Museum and Department of Botany and Range Science, Brigham Young University, Provo, Utah 84602 N. Duane Atwood USDA Forest Service, Intermountain Region, Ogden, Utah 84401 Sherel Goodrich Intermountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Ogden, Utah 84401 Larry C. Higgins Herbarium, Department of Biology, West Texas State University, Canyon, Texas 79016 Follow this and additional works at: https://scholarsarchive.byu.edu/gbnm Part of the Anatomy Commons, Botany Commons, Physiology Commons, and the Zoology Commons Recommended Citation Welsh, Stanley L.; Atwood, N. Duane; Goodrich, Sherel; and Higgins, Larry C. (1987) "Division Lycopodiophyta," Great Basin Naturalist Memoirs: Vol. 9 , Article 6. Available at: https://scholarsarchive.byu.edu/gbnm/vol9/iss1/6 This Chapter is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist Memoirs by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. 1987 Welsh etal: A Utah Flora. Isoetaceae, Selaginellaceae 13 DIVISION LYCOPODIOPHYTA Isoetes holanderi Engelm. Bolander Quillwort. Leaves mostly 2-12 cm long, gradualK tapering from the broad base, slender, soft; hyaline margins extending to ca 1 cm Clubmosses above
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