Objectives:
1. Describe the current classification of land plants
2. Outline the life cycle of moss and ferns3. Contrast gymnosperms and
angiosperms/monocots and dicots4. Discuss the function of several types of plant
tissue
Text Reference
Chapters 22, 23, 24
Classification
Kingdom Plantae
multicellular, eukaryotic, non-motile, contain chlorophyll a + b, cell walls of cellulose, reproduce sexually
Phylum Bryophyta
Lack vascular tissue
Gametophyte dominant.
Live in moist areas.
Reproduction dependent on water.
Moss, liverworts
Phylum Tracheophyta
Contain xylem and phloem
Sporophyte dominant
Most common plants.
Subphylum Spermopsida
Seed plants.
(Gymnosperms – naked seeds.)
Class Coniferae – seeds in cones. Needle-like leaves.
Class Angiospermae
Flowering plants.
Seeds develop in ovaries.
Subclass – Monocotyledonae
Embryo with a single cotyledon
leaves parallel
flower parts in threes
Grasses, palm
Subclass – Dicotylendonae
Embryo with two cotyledons
Netted veination
Flower parts in 4 or 5
Life cycles of moss and ferns
Haploid (N)
Diploid (2N) MEIOSIS
FERTILIZATION
Maturesporophyte
(2N)
Gametophyte(N)
Gametophyte(N)
Youngsporophyte(2N)
Zygote(2N)
Sperm(N)
Sperm(N)
Egg(N)
Spores(N)
Capsule(sporangium)
Protonema(young gametophyte)(N)
Malegametophyte
Femalegametophyte
Antheridia
Archegonia
Figure 22–11 The Life Cycle of a Moss
Haploid gametophyte (N)
Diploid sporophyte (2N)
MEIOSIS
FERTILIZATION
Maturesporophyte(2N)
Gametophyte(N)
Frond
Sperm
Egg
Spores(N)
Antheridium
Archegonium
Developingsporophyte(2N)
Sporophyteembryo(2N)
Maturegametophyte(N)
Younggametophyte(N)
Sporangium(2N)
Figure 22–17 The Life Cycle of a Fern
The Spermopsida
A. Overview.
Designed for life on land
B. Adaptations
Stems
Hold leaves up to sunlight
Transport water and nutrients
Leaves
Perform photosynthesis
Vascular tissueTransport materials
Xylem- transports water and nutrients toward the leaves.
Phloem- transports the products of photosynthesis around the plant
Reproductionadapted for life on “dry” land
Pollen – contains sperm
Seeds- contains embryo Fig. 22-5 p. 470
Angiosperms
Flowering plantsEgg is protected in an ovary. Ripe ovary is a fruit
1. Monocots- Fig 22-12 p. 475
2. Dicots- Fig 22-12 p. 475
A square watermelon.
Plant Tissue
Meristematic tissue
Produces new cells by mitosis.
Undifferentiated.
Meristematic tissue
1. Apical meristem – at the tip of a growing stem or root
2. Cambium – allows stems and roots to grow thickerVascular cambium
Cork cambium
Pericycle
Epidermal tissue
Provides protection
Cork(bark) – keeps water out
Epidermis – lets water in
Parenchyma
Thin walled cells
Store things
Some contain chloroplasts
Some store starch
Sclerenchyma
Thick walled cells
Support the plant
Vascular tissue
Internal transport
Xylem
Made of tracheids
Long narrow cells with openings at each end Fig 23-6 p. 493
Vessel elements
Much larger than tracheids
Transport water.
PhloemTransports plant products
Fig. 23-7 p. 493
Sieve tube elements- allow the passage of materials
Companion cells - control activity of the sieve tube
I know what you are thinking.
You are thinking………Mr. Barnes…………….
May we please, please, please, please, please, please, please, please, please, please, please, please, please, please, please, please, please, please
Have a ………………..FunReview Activity!!!!!!!!!!
Diagram the life cycle of
• Moss
• Fern
• Flowering plant Label haploid (gametophyte) and diploid
(sporophyte) phases
Have a great day!
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