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Week Four Notes

by: Kiana Encinas

Week Four Notes Bot 105

Kiana Encinas
General Botany
Frank Shaughnessy

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About this Document

This week we discussed various topics including mitosis, osmosis, development and growth of plants (primary and secondary), cell division, chromosome structure, and water potential.
General Botany
Frank Shaughnessy
Class Notes
Meristem, Embryophyte development, Mitosis, Osmosis, Plant development, cell division, Chromosomes, water potential, osmotic potential, pressure potential, primary development, secondary development
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This 3 page Class Notes was uploaded by Kiana Encinas on Saturday September 19, 2015. The Class Notes belongs to Bot 105 at Humboldt State University taught by Frank Shaughnessy in Summer 2015. Since its upload, it has received 39 views. For similar materials see General Botany in Botany at Humboldt State University.


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Date Created: 09/19/15
Week Four General Botany Lecture and Lab Notes 914 916 and 918 lecture notes 917 lab quiz and lab summary 914 Suggested reading on cohesion tension theory First half of chapter 30 Water can be outside of all of the cells and between cells up until the epidermis Passage cells are pumping water in the xylem Osmosis of passage cells of the endodermis is pumping H2O into the xylem stream This creates positive root H2O pressure Phloem gets water from xylem to move sugar Development growth 1 2 3 916 Cell division Division of nucleus and cytoplasm 2 parts of cell division called mitosis growth and meiosis sexual reproduction Mitosis Produces two daughter cells from one parent Daughter cells and parent cells are genetically identical 0 There is no change in ploidy of copies of each chromosome Haploid1 copy of each chromosome Diploid 2 copies of each chromosome Triploid 3 copies of each chromosome etc 0 When you want to count the of chromosomes you count the centromeres Cell enlargement by osmosis Not yet discussed Cell Differentiation Not yet discussed Mitosis lnterphase DNA replicated and chromosomes are not condensed Prophase chromosomes are condensed and the nuclear envelope membrane starts to break apart Metaphase the Kinetochore microtubules are placing chromosomes on the microphase plate Anaphase sets of daughter chromosomes separate and move toward opposite poles Telephase chromosomes move to opposite poles and the nuclear envelope is reformed Microtubules are placing vesicles with new membrane and primary wall material across the cell Root or Shoot apical meristem Primary meristems are the protoderm ground and procambium All undergo cell expansion by osmosis Protoderm epidermal tissue Ground meristem parenchyma of pith and cortex filler Procambium vascular tissue 917 Lab Laboratory 4 objectives Understand the steps of mitosis and the function of this type of nuclear division Understand diffusion and osmosis and how osmosis works in the vacuole to create larger cells Know the different types of plant meristems and the kind of growth that they produce Know the process of development in plant roots and shoots from mitosis to secondary growth Mock Quiz Questions Study for next week s lab quiz 918 Show the lab instructor a cell in the anaphase stage of division In which of the two tradescantia trichome preparations that were made was the water potential lower outside of the cell than inside distilled water or NaCl Which of the three primary meristems is being indicated by the pointer in the microscope Name a tissue that could develop from the primary meristem indicated in the microscope Name the structure being indicated in the microscope and what the name of the meristematic ring of cells that produce this structure is called 0 Water Potential potential free energy of H20 that is due to the product of osmosis potential and pressure potential 0 Osmotic potential change in free energy of H20 produced by the addition of a solute such as sugar or salt Pure water no solute 00 mpa So osmotic potential always negative because solutes are always present 0 Pressure potential effect of cell wall pressure on negative water potential 0 Water moves from high to low water potential 0 ln living cells solutes bond to H2O molecules decreasing their energy Primary Development 0 Meristematic cegt Vessel element fiber sieve tube element companion cell parenchyma cell 0 Region of cell division region of elongation region of maturation 0 Lateral root grows from pericycle which is located just below the epidermis Passage cells are not found above the root hairs 0 Primary development ends when the plant starts growing lateral roots Secondary Development Takes place only in some species 0 Secondary development makes the plant increase in width not height 0 2 lateral meristems are the vascular cambium and cork cambium Occurs in roots and stems Cork cambium occurs outside of the vascular cambium


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