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Download Annette Miles Life Science - Week 13 - Mrs. Rubright
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The Life Cycle of Moss & Fern Life Science - Week 13 - Mrs. Rubright Powerpoint By: Annette Miles Moss can be found growing on forest moist shaded habitats. floors and other ______, non-vascular so it does not This plant is _____________, have true roots, stems, and leaves. Instead of stems, moss has a _____ stalk called a _____. seta Instead of leaves, moss has ______. scales Instead of roots, moss has _________ rhizoids that anchor it into the soil. Branched rhizoids of a moss The most dominant phase of moss is the gametophyte green ____________. •Some mosses can reproduce asexually by fragmentation. •Asexual reproduction occurs during the Sporophyte phase The sex organs are located at the top of the gametophyte. The male plant antheridia which contain develops an __________ ______ cells. sperm The female plant develops an archegonia __________ containing an ____. egg Egg Fertilization of the egg requires a ____________ water that will permit sperm drop of ______ cells to swim from the antheridia to the archegonia. A _______ zygote will form. http://www.youtube.com/watch?v=jcWYAnmm-QE Once the eggs are fertilized, it is now a archegonia at ________ zygote imbedded in the ___________ the top of the gametophyte plant. The zygote develops into a simple embryo sporophyte that grows into the mature ____________ emerging from the top of the gametophyte plants. stalked capsules represent the sporophyte The _______________ stage of the life cycle. The sporophytes grow in attachment to the gametophytes and are _____________ nutritionally dependent on them. The ________ spores produced within the capsule are released and carried away by wind When they land in a damp the _____. _____ area, they grow into a new gametophyte. 1 2 12 3 11 10 4 9 8 7 5 6 5. Fern life cycle Fig 17.6 Polypodium – a genus of true fern Sori – a cluster of sporangia Sporangia - structures producing and containing spores A sorus Polypodium Sporangia Developing spores Polypodium Gametophyte Developing sporophyte In lines on a broadleaved type Asplenium At the end of the leaves Adiantum Cibotium menziesii in habitat in Hawaii. Photo courtesy of Peter Richardson. Cyathea australis with the uncurling croziers visible. Photo courtesy of Scott Ridges
