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~ Algae ~ Bryophytes ~ Ferns ~ Angiosperms ~ Gymnospe

Diversity of organisms. ~ Algae ~ Bryophytes ~ Ferns ~ Angiosperms ~ Gymnosperms. Evolution . Algae.

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~ Algae ~ Bryophytes ~ Ferns ~ Angiosperms ~ Gymnospe

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  1. Diversity of organisms ~ Algae ~ Bryophytes ~ Ferns ~ Angiosperms ~ Gymnosperms

  2. Evolution

  3. Algae • This is a collective name for a varied group of phyla with no one diagnostic feature. They are normally aquatic or live in damp terrestrial habitats. Subdivisions are mainly associated with biochemical differences related to photosynthesis.

  4. Algae are without roots, stems or leaves. • All contain chlorophyll and so can make their own food by photosynthesis. • The cells are long and their cellulose cell walls are covered by a layer of mucilage. • The major are green, but some are brown or red.

  5. Feature of plant

  6. Structure of algae

  7. diatom

  8. Type of algae Green algae Brown algae

  9. Volvox

  10. analipus Example of algae egregia

  11. Bryophytes • Bryophytes are small green plants with simple leaves, stems but no roots. • They grow close to ground, and usually do not grow more than 2cm in length. • They do not have vascular tissue which enables the plant to grow tall, and which they have no support to be stiff. • They are anchored in the ground by delicate structure called Rhizoid. • They live in damp places.

  12. - The life cycle of Bryophytes begins with the release of haploid spores. Spores that geminate begin cell division, this produces the filament that will eventually form a gametophyte.

  13. Photo of bryophytes

  14. moss

  15. liverwort

  16. Life cycle of bryophytes

  17. Archegonia

  18. Feature of plant

  19. Ferns • Ferns consist of true stems, roots, leaves and vascular tissues. • Their roots grow horizontally underground • The preferred habitat of a fern is in the wetlands, or in moist woody areas; they also prefer damp shaded area. • They need water for fertilization. • As for reproduction, they reproduce by spores and vegetatively by rhizomes, which are horizontal underground stems.

  20. Photo of ferns

  21. Life cycle of ferns

  22. Feature of plant

  23. Gymnosperms(conifers) • Gymnosperms are large evergreen trees with seeds growing inside cones for reproduction. • Most of them have needle-shaped leaves. • It does not have flowers but seeds. The seeds are naked. They are not enclosed in food and borne on structure called cones. Example is pine.

  24. In conifers, the region of primary cell wall in the centre of the pit is thickened with a deposit of waxy material, forming a structure known as a torus. The phloem of conifers contains sieve cells, fibres, and parenchyma cells, but companion cells are absent.

  25. Pine Examples of gymnosperms

  26. Feature of plant

  27. Angiosperms • All angiosperms have flowers for reproduction. • Their seeds are produced inside the ovary. • Angiosperms form the dominant terrestrial vegetation today. • They are found in a wide range of habitats and have even re-established themselves in freshwater and the sea.

  28. - They are extremely well suited to life on land both in their morphology. - They are divided into dicotyledons and monocotyledons.

  29. Morphology of herbaceous dicotyledon

  30. Lily Morphology of herbaceous monocotyledon

  31. Comparison of moncotyledoneae and dicotyledoneae

  32. Life cycle of angiosperms

  33. Feature of plant

  34. Summary of plant kingdom

  35. PRESENTED BY: TSANG MAN YEE 6B (26) YIK WAI TUNG 6B (31)

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