UT Arlington BIOL BIOL 3427 - Ch 22 Seedless Plants (12 pages)

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Ch 22 Seedless Plants



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Ch 22 Seedless Plants

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Pages:
12
School:
University of Texas at Arlington
Course:
Biol Biol 3427 - Plant Science
Plant Science Documents

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Chapter 22 Seedless Plants Objectives 22 1 Mosses Identify some characteristics of mosses Describe the life cycle of mosses 22 2 Liverworts and Hornworts Discuss the characteristics of liverworts and hornworts Compare and contrast liverworts hornworts and mosses 22 3 Seedless Vascular Plants Describe the characteristics of seedless vascular plants Compare whisk ferns club mosses and horsetails 22 4 Ferns Describe the characteristics of ferns Explain the life cycle of a fern 1 22 1 Mosses Similar to first land plants Nonvascular plant belonging to class Musci and division Bryophyta 14 000 species more than any other bryophyte most are tropical some can survive dry climates all need water to complete their life cycle common characteristics include photosynthetic multicellular sexually reproducing eukaryotic non complicated vascular system water moves cell to cell by osmosis since most mosses are only a few cells thick live on moist brick walls cracks of sidewalks forest floors shady sides of trees The Life Cycle of Mosses Typical moss alternates between haploid gametophyte N and diploid sporophyte stages 2N Gametophyte stage Small gametophyte is longest lived part of the life cycle Leaf like photosynthetic structures lack vascular tissue and are usually only one cell thick Have rhizoids on underside to anchor moss Sporophyte stage usually smaller and attached to the gametophyte Lacks chlorophyll depending on gametophyte for food Foot of gametophyte anchors it to sporophyte 2 Stalk grows up and is topped by a capsule Capsule sporangium is the structure that forms haploid spores Sexual Reproduction Produce two kinds of gametes egg sperm Gametes surrounded by sterile cells that protect them from drying out Eggs are large w much cytoplasm and immobile Sperm are smaller flagellated and must swim through water to fertilize the egg Archegonium the egg producing structure of a moss Flask shaped 3 Forms on branches of gametophyte Each archegonium forms one egg Antheridium



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