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Plant Kingdom - PLANT KINGDOM Eukaryotic multi-cellular...

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P LANT K INGDOM Eukaryotic, multi-cellular, photosynthetic, autotrophs . Cell wall of cellulose (a very complex compound – so that predators will find it harder to digest). 3 life cycles: Non-vascular, seedless, seeding . 1. Non-vascular life cycle (for e.g. Moss): >> Don’t have vascular tissues ( Phloem, Xylem ) >> Moss – all cells are very similar (very primitive plants) >> Moss can only grow in wet conditions. >> First plants didn’t need roots because they were in wet conditions already. >> Only moss and ferns use sperms and eggs. Other plants, especially seeding plants use pollen . Life Cycle: Gametophytes make gametes that make a zygote, which becomes a sporophyte and produces spores, which grow into gametophytes. This keeps on recurring.
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The gametophytes are originally haploid cells, unlike in humans. 2. Seedless Plant Life Cycle (e.g. Fern): >> Similar to the other three cycles except the way it happens. >> The sporophyte state is more dominant in the seedless and seeding plants life cycles.
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