General Biology I Lab Practical Notes 7-11

General Biology I Lab Practical Notes 7-11 - Ann Halmi...

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Unformatted text preview: Ann Halmi General Biology I Lab Practical Notes 7-11 [Section B6 – 9:00 AM in Room 140] LAB 7: Plant Evolution –Look at cellular specialization in plants with an emphasis on lignified cells that function in water transport and/or support • Lignin – Very strong molecule that contributed to the success of land plants o Xylem Tracheids – First to evolve, combined the functions of support and water transport, long slender cell Vessel Elements – Evolved from tracheids, cells specialized for water transport, short and wide cell with no end walls between cells that make up a vessel Fibers – Evolved from tracheids, cells specialized for support only (can also be found in the phloem and other parts of the plant), has almost no central cavity when the cell dies at maturity –Study the evolution of these vegetative structures in representative plants: • Moss (Bryophyte – Mnium) o Gametophyte dominant o Sporophyte is dependent on gametophyte o Water is needed for reproduction (swimming sperm) • Fern o Sporophyte dominant o Sporophyte and gametophyte = free living o Vascular (tracheids) o Water is needed for reproduction • Gymnosperm (Pine) o Sporophyte Dominant o Gametophyte is dependent on sporophyte o Vascular (only tracheids in xylem) o Lots of lignin o Pollen • Angiosperms o Sporophyte dominant o Gametophyte is dependent on sporophyte o Vascular (tracheids, fibers, vessel elements) o Pollen o Seeds o Flowers o Fruits Woody Angiosperm (Brasswood – Tilia) Non-woody Angiosperm (Buttercup – Ranunculus) –Examine the evolution of sexual cycles in: • Moss o Antheridium o Archegonium • Typical Fern o Frond o Sori o Fertile Frond – Cinnamon fern o Antheridia o Archegonia • Gymnosperm o Heterosporous Microsporocyte Microspore Microgametophyte – Pollen Megasporocute Megaspore Megagametophyte – Storage tissue around the embryo within the seed –Be able to identify the various lignified cell types in stem cross sections –Know how to tell a moss from a fern • Moss o Gametophyte is dominant • Fern o Sporophyte is dominant and well adapted to land o Gametophyte is a free-living, autotrophic organism, not well adapted to land –Know how to tell a gametophyte from a sporophyte • Sporophytes o Produce spores by meiosis o Diploid • Gametophytes o Produce gametes by mitosis o Haploid –Understand which cells are haploid and which are diploid • Haploid o Gametes • Diploid o Zygote –Understand which cells are formed by mitosis, meiosis, or fertilization •...
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This note was uploaded on 04/05/2012 for the course BIO 101 taught by Professor Martin during the Summer '08 term at Rutgers.

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General Biology I Lab Practical Notes 7-11 - Ann Halmi...

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