Biology 11 Kingdom Plantae: Algae and Bryophyta
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1 Biology 11 Kingdom Plantae: Algae and Bryophyta
2 Objectives By the end of the lesson you should be able to: State the 3 types of algae Why we believe land plants developed from algae Lifecycle of a bryophyte Examples of bryophytes
3 The First Plants For more than 3 billion years, Earth s terrestrial surface was lifeless o life evolved in the seas o plant life evolved in the seas from algae o 1st photosynthetic organisms were aquatic green algae Chlamydomonas
4 Brown Algae Kingdom Protista Phylum Heterokontophyta Mostly marine and temperate. Kelp
5 Red Algae Turkish Wash Cloth Kingdom Protista Phylum Rhodophyta Most common in warmer tropical waters In temperate zones, found in deeper water
6 Green Algae Kingdom Protista Phylum Chlorophyta Very diverse group Include 3 forms: o unicellular o colonial o multicellular Live in all environments: fresh and salt water, soil Ulva sp. Sea lettuce
7 A) Unicellular Green Algae Very common in fresh water as part of phytoplankton. Ex. Chlamydomonas sp.
8 B) Colonial Green Algae Live in long filaments or as colonial spheres. Filamentous green algae Volvox, spherical colonial
9 C) Multicellular Green Algae Mostly marine. Ancestors of land plants
10 Evolution of Land Plants 500 mya land plants evolved o special adaptations for life on dry land protection from drying = desiccation owaxy cuticle gas exchange (through cuticle) ostomatas water & nutrient conducting systems oxylem & phloem protection for embryo oseeds
11 Kingdom Plantae Autotrophic Photosynthetic Cells contains chloroplasts Multi-cellular Sexual and asexual reproduction Cell wall cellulose
12 Animal vs. Plant life cycle Animal Plant diploid multicellular 2n diploid multicellular sporophyte 2n mitosis meiosis fertilization meiosis gametes 1n spores 1n fertilization haploid unicellular gametes 1n mitosis haploid multicellular gametophyte 1n mitosis alternation of generations
13 First land plants Bryophytes: mosses & liverworts o non-vascular no water transport system no true roots o swimming sperm flagellated sperm o lifecycle dominated by haploid gametophyte stage Where must mosses live? fuzzy moss plant you are familiar with is haploid o spores for reproduction haploid cells which sprout to form gametophyte haploid diploid
14 The Bryophytes Includes: mosses, liverworts and hornworts Called non-vascular plants because their dominant stage (gametophyte) lacks vascular tissues Show many of the characteristics believed to be in the first land plants What problems did the Bryophytes face when moving onto land from water?
15 The Bryophytes Their Solutions: Protect the embryo Thin waxy cuticle Utilizing air for species distribution
16 Video Typical Life Cycle
17 The Bryophyte Life Cycle Utilize Alternation of Generations from algae Gametophyte (n) shows two distinct sexes: the male antheridium and the female archegonium This is the dominant stage (gametophyte) and is involved in sexual reproduction
18 The Archegonium This is the female shoot It contains the archegonium (at the top of the shoot) which is: - dominant - haploid (n) - produces by mitosis and contains the egg
19 The Antheridium The male gametophyte, the antheridium (top of shoot), is: - dominant - haploid (n) - produces motile sperm by mitosis Fertilization occurs when there is enough water for the sperm to swim to the egg (in the archegonium)
20 The Sporophyte Fertilization results in a diploid sporophyte which grows out of the archegonium and forms a spore capsule Sporophyte contains vascular tissue It produces haploid, wind borne spores by meiosis These spores then germinate to form the gametophytes
21 Gametophyte and Sporophyte
22 Other Bryophytes The Liverworts There are about 8500 species of liverworts Live from the arctic to the tropics Leafy, close to the ground. Gametophyte is dominant
23 Other Bryophytes Sporophyte of a hornwort The Hornworts Less common but similar in habitats Gametophyte is dominant with sporophyte containing a stalk with primitive vascular tissue
24 Bryophytes: mosses & liverworts
25 Peat Bog Peat Moss
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