O�Keefe by zujt6g

VIEWS: 23 PAGES: 40

									O’Keefe
O’Keefe
Monet
Matisse
Manet
van Gogh
   Picasso
   Escher
   Salvador Dali
Abstract Art
Extra Credit (+5 max)




   Create an abstract representation of an
    angiosperm(s) utilizing similar techniques you
    have seen by some of the greats.

   Due 3/14-15
Chapter 38 Quick Overview

  Flower Anatomy

     Sepals, Petals, Stamens (M), Carpels (F)
      Male            Female
     (Stamens)         (Carpels)
      Filament        Stigma
     Anther           Style
     Pollen (sperm)    Ovary, ovule
                       Receptacle
  


             Embryo sacs
Pollination:


                  (pollinating agents)
                  Self pollination
                   vs. self incompatible
                   (“self”/ “nonself”)
                  S-genes
                   (fig. 38.6 + fig. 38.5)
                  Sporophytic and
                   gametophytic self-
                   incompatibility
    “Self-Incompatibility”
    prevents Self-Fertilization in some plants




   Self/Non-self recognition
   How is this different from humans?

   If “SELF” is detected:
        RNA hydrolyzing enzymes may
          destroy pollen
        Or Stigma maybe affected
Germination

   Plants in Motion - Corn germination
Fruit Types

 What   is the
  definition of a
  “true fruit” ?
 Simple, aggregate
  multiple (p.738)
Asexual Reproduction

   clone of parent
   vegetative reproduction, fragmentation,
    apomixis (unfertilized-- seed production)
   Protoplast fusion p.742
   What is monoculture?
CHAPTER 39
Control Systems in Plants

   Plant Responses to Internal and External
    Signals
    What is a hormone anyway?


Hormone:

    Greek for “to excite
- produced in a specific area
-   travel to another specific area
    (target organ)
-   used in minute concentrations
The Main Players

   5 PLANT HORMONES to know …
    and their functions, target sites, plant
    conditions, examples
      auxin
       cytokinin
       gibberellin
       ethylene
       abscisic acid
Auxin

   IAA (indoleacetic acid)
   Location: seed embryo; meristems of apical buds and
    young leaves
   Function: stem elongation; root growth, differentiation,
    branching; fruit development; apical dominance;
    tropisms
   Auxin over time
    Cytokinins

   Modified forms of adenine
   Location: roots (and actively growing tissues)
   Function: root growth and differentiation; cell division
    and growth; germination; delay senescence (aging);
    apical dominance (w/ auxin)
Gibberellins

   GA3
   Location: meristems of apical buds and roots,
       young leaves, embryo
   Function: germination of seed and bud; stem
       elongation; leaf growth; flowering (bolting); fruit
    development; root growth and differentiation
    Abscisic acid

   ABA
   Location: leaves, stems, roots, green fruit
   Function:
    Ethylene

   Gaseous hormone
   Location: ripening fruit tissue; stem nodes; aging
    leaves and flowers
   Function: fruit ripening; oppositional to auxin (leaf
    abscission); promotes/inhibits: growth/development of
    roots, leaves, and flowers; senescence
Chapter 39.2
Daily and Seasonal Responses
     Circadian rhythm (24 hour periodicity)
     Photoperiodism (phytochromes – red light sensitive)



     Short-day plant: light period shorter than a critical length to flower (flower
      in late summer, fall, or winter; poinsettias, chrysanthemums)
     Long-day plant: light period longer than a critical length to flower (flower
      in late spring or early summer; spinach, radish, lettuce, iris)
     Day-neutral plant: unaffected by photoperiod (tomatoes, rice, dandelions)
     Critical night length controls flowering
     Let's see this
Phototropisms

   Cryptochromes (blue light sensitive)
   Positive is growth toward light
   Negative growth away from

   Sunflower phototropisms
   Sunflower photomorphogenesis
Thigmotropisms

   Morning Glory response

   Mimosa plant response
    –   Example of turgor pressure change as well
Gravitropisms

   Depends on starch filled vessels
    (amyloplasts) Orientation changes result in
    differential growth causing curvature.
   Roots display positive
   Stems display negative

   Let’s see it
Lab 5 – Cellular Respiration in
Germinating Peas

   C6H12O6 + O2 - - - > CO2 + H2O

   Issue of O2 & CO2
    Solution: KOH + CO2  K2CO3
   Also PV = nRT
    so, if water temp and volume is constant then water will move toward lower
    pressure area. As oxygen is consumed during respiration, its volume is
    reduced. Net result is a decrease in volume within in the tube and thus a
    decrease in pressure in the tube (so water will continue to move in as
    respiration occurs)

   Purpose of only rock tube?
    Allow detection of any changes in volume due to atmospheric pressure
    changes or temperature changes.

								
To top