PLSC 206

Card Set Information

PLSC 206
2011-11-02 21:26:53

Lets pass
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  1. 2,4-D
    Herbacide affected to broad leaf plants;widely used on lawns
  2. Abscissic acid
    "ABA"- prevents seed germination;little affect on abscission; Regulates water flow by triggering stomatal closure
  3. Annual
    Complete life cycle in single growth season
  4. Apical dominance
    Control of axillary bud development(branching) by the apical bud
  5. Auxin
    Stimulates stem elongation and cell enlargement; promotes reactivation of vascular cambium in spring in perennials
  6. Biennal
    Plants that grow vegetatively throughout one growing season but flower and produce seed only second growing season
  7. Bolting
    Induces seed production in biennials; Rosette plants produce seed the first year; Rapid stem elongation to initiate flower development
  8. C-3 Pathway
    Needs 18 moles of ATP/mole glucose
  9. C-4 Pathways
    Transports CO2 from mesophyll to bundle sheath; needs 30 moles of ATP/mole glucose
  10. Canopy
    Collective term for all light; intercepting plant parts-mostly leaves, but stems, fruit occasionally signifigant
  11. Carbon Dioxide compensation level
    CO2 concentration at which plants show no net fixation of CO2
  12. Chlorophyll
    Absorbs light in red and blue range; not green
  13. Climacteric
    Increase in fruit repiration and ethylene production just before repining
  14. Cytokinin
    Stimulate cell division; Promotes mitosis
  15. Dark Reaction (Calvin Cycle)
    Reactions do not require light, if proper reactants are added (ATP, NADPH)
  16. Day Neutral
    Daylength has no effect on flowering
  17. Endogenous
    A naturally-produced substance; Produced within the organism on which it is acting
  18. Ethylene
    Gas at room temperature; All parts of angiosperms; Large amounts by roots, nodes, flowers, ripening fruits; Promotes abscission of leaves and fruit; effects contagious
  19. Evaporation
    Conversion of liquid water to water vapor
  20. Far-Red Light
    Promotes flowering in long day plants; Inhibits flowers in short day plants
  21. Field capacity
    Ability of soil to hold water against gravity
  22. Flaccid (Wilted)
    Negative pressure potential
  23. Geotropism
    Upward growth of shoots and downward growth of roots
  24. Gibberellin
    Stimulates flower and fruit development; Initiates flowering; Controls seed germination
  25. Growing season
    Time from last freeze in spring to first killing frost in fall
  26. Indoleacctic acid
    "IAA"- Active compound in plant tissues; Produced in apical buds, young leaves, endosperm and embryo
  27. Intermediate day-plant
    Flower only when exposed to days of intermediate length
  28. Light compensation level
    As light intensity increases above 0, CO2 decreases because there is assimilation by photosynthesis
  29. Light reaction
    Chlorophyll absorbs light energy -> splits water -> creates ATP
  30. Light saturation level
    The light intensity where the rate of photosynthesis does not increase when light intensity does
  31. Long-Day plants
    Flower only if daylight is greater than some critical lengths; Short-night plant
  32. Matric potential
    Ability of the water molecules to absorb to cellulose fibers
  33. Net Photosynthesis
    g CO2 m2 /hr assimilated in light; can also measure O2 production; Total photosynthesis minus respiration)
  34. Osmotic potential
    Molecules of dissolved substances seperate water molecules, reducing interation among water molecules; Always negative
  35. Perennial
    Require multiple years to complete life cycle
  36. Photomorphogenesis
    Light changes type of growth; A non-directional development response to a non-periodic, non-directional light stimulus
  37. Photoperiodism
    Same plants flower only at certain tiems of the year; In tropics, flowering occurs year round
  38. Photorespiration
    Maintaining adequate CO2 concentration in leaf depends on keeping stomates open
  39. Photosynthesis
    Assimilation of CO2 in light; Light reaction and dark reaction- in chloroplast
  40. Phototropism
    Directed growth toward or away from light; Stonger than geotropism
  41. Phytochrome
    Pigment involved in photoperiod and several other effects
  42. Pinching
    Shoot tip removal, induces growth of axillary buds, increase branching and flower production
  43. Pressure potential
    A physical pressure; May be positive or negative
  44. Relative humidity
    Actual vapor pressure/saturation vapor pressure (%)
  45. Respiration
    Is reverse of photosynthesis in terms of initial and final product
  46. Saturation vapor pressure
    Vapor pressure at atmosphere maximum water holding capacity
  47. Transpiration
    Principal driving force for movement of water through plant; Evaporation from plant tissue
  48. Turgor pressure
    Outward force against cell wall
  49. Vapor pressure
    Fraction of atmosphere pressure exerted by water pressure
  50. Vapor pressure dificit
    Difference between current vapor pressure and saturation vapor pressure
  51. Water potential
    Water always flows passively from higher to lower water potential