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Diversity in the plant kingdom © 2008 Paul Billiet ODWSODWS.

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Presentation on theme: "Diversity in the plant kingdom © 2008 Paul Billiet ODWSODWS."— Presentation transcript:

1 Diversity in the plant kingdom © 2008 Paul Billiet ODWSODWS

2 Bryophyta  Small terrestrial plants restricted to damp habitats  Water is needed for fertilisation  Spores ensure dispersal © 2008 Paul Billiet ODWSODWS

3 Bryophyta  Hepaticae the liverworts  Prostrate thallus with rhizoids © 2008 Paul Billiet ODWSODWS

4 Bryophyta  Musci the mosses  Erect stem with leaflets +/- rhizoids © 2008 Paul Billiet ODWSODWS

5 Filicinophyta the ferns  Water still needed for fertilisation  Spores ensure dispersal  Vascular plants  Lignified tissue (wood) may be present  Differentiated into: leaves, stem, roots, rhizome © 2008 Paul Billiet ODWSODWS

6 Filicinophyta procosara.org/san_rafael_en,photo,64?PHPSESSI...

7 Coniferophyta the conifers  Vascular plants  Seed plants  Seeds contain a food store for an embryo inside protective coat  Seeds ensure dispersal  Naked seeds born in cones © 2008 Paul Billiet ODWSODWS

8 Coniferophyta Araucaria sp. (Monkey-puzzle)

9 Angiospermophyta the flowering plants  Vascular plants  Seed plants  Seeds protected by an ovary which becomes a fruit  Fruit, a structure that encourages seed dispersal © 2008 Paul Billiet ODWSODWS

10 Summary FeatureBryophytaFilicinophytaConiferophytaAngiospermophyta Common name MossesFernsConifersFlowering plants LeavesScalesYes RootsRhizoidsYes Vascular system NoYes Woody tissue SmallYes Waxy cuticle Damp habitats Yes Water for fertilisation Yes No SeedsNo Yes ConesNo YesNo FruitNo Yes © 2008 Paul Billiet ODWSODWS

11 Dicotyledons & Monocotyledons  Angiosperms are divided into two groups  The basic distinguishing feature are embryonic leaves (coytledons)  Cotyledons are found in the seeds of these plants © 2008 Paul Billiet ODWSODWS

12 Dicotyledon seed Seed coat or testa Cotyledons acting as a food reserve Plumule (to become the first true leaf) Radicle (to become the first root) Micropyle © 2008 Paul Billiet ODWSODWS

13 Monocotyledon seed Seed coat Cotyledon Plumule Radicle Endosperm (food reserve) © 2008 Paul Billiet ODWSODWS

14 Dicots v Monocots – other differences DicotyledonsMonocotyledons Tap roots and lateral branches Fibrous adventitious roots Net-veined leavesParallel-veined leaves © 2008 Paul Billiet ODWSODWS

15 DicotyledonsMonocotyledons Vascular tissue in a ring round the stem Vascular tissue scattered throughout stem Flowers with multiples of 4 or 5 organs Flowers with multiples of 3 organs Dicots v Monocots – other differences Vascular tissue Pith Epidermis Cortex Vascular tissue © 2008 Paul Billiet ODWSODWS


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