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Ch. 22 – Plant Diversity.

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Presentation on theme: "Ch. 22 – Plant Diversity."— Presentation transcript:

1 Ch. 22 – Plant Diversity

2 22-1: Introduction to Plants
Kingdom Plantae: Multicellular eukaryotes Cell walls  Cellulose Develop from multicellular embryos Photosynthesis  Chlorophyll a & b

3 The Plant Life Cycle ALTERNATION OF GENERATIONS =
Life cycle in which haploid and diploid generations alternate with each other.

4 What do plants need to survive?
Sunlight Water & Minerals Gas exchange Movement of water & nutrients

5 From Water to Land 1st plants arose in water for reproduction
Needed to survive on land: more resistant to sunlight water conservation reproduction without water

6 Problems Solved! Waxy cuticles Stomata Vascular Tissue
Woody tissue – lignin Pollen Seeds Flowers Fruit

7 22-2: Bryophytes Lack vascular tissue Depend on water for reproduction Close to ground due to water transport being done by osmosis Gametophyte is dominant stage

8 Examples of groups of Bryophytes:
Mosses Hornworts Liverworts

9 Life cycle of Bryophytes

10 Reproductive Parts of the Bryophytes
Male Gametophyte Female Gametophyte

11 22-3: Seedless Vascular Plants
Sporophyte dominant form Vascular Tissue: Xylem Phloem Transports: Water Nutients Carbs. Cell Types: Tracheids Vessel elements Sieve tube elements Companion cells

12 Examples of Seedless Vascular Plants:
Horsetail Club Moss

13 Ferns Sori with sporangia

14 22-4: Seed Plants ADAPTATIONS Reproduction free from water
Flowers = Angiosperms Cones = Gymnosperms Transfer of sperm  Pollination Protection of embryos in seeds ADAPTATIONS

15 22-5: Angiosperms – Flowering Plants
Monocots Dicots Seeds 1 cotyledon 2 cotyledons Leaf veins Parallel Branched Flowers 3’s 4’s or 5’s Stems VB scattered VB arranged Roots Fibrous Taproot

16 3 Types of Life Spans Annuals = 1 season, garden plants
Biennials = 2 growing seasons, primrose Perrenials > 2 years, grasses


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