Lab 2

• produces the tissues of the secondary vascular tissues

  VASCULAR CAMBIUM
• Lateral Meristems 


  Forms the secondary plant body
• produces the tissues of the periderm

  CORK CAMBIUM
• T/F. Periclinal types of division gives rise to the tissue derivatives 


  True
• T/F. Anticlinal division gives rise to more derivatives

  False. Initials
• vascular cambium

  • meristem that forms the secondary vascular tissues
  • found in organs that undergo secondary growth
  • can be continuous or found in bundles
• order of the vascular bundles that underwent secondary growth

  primary xylem

  secondary xylem

  secondary phloem

  primary phloem
• closed vascular cambium

  found in monocots; no vascular cambium
• bifacial

  abaxial (outer) ex. phloem

  adaxial (inner) ex. xylem
• cambial zone

  • wide zone of more or less undifferentiated cells
  • the initials are difficult to distinguish from their recent derivatives
• vascular cambium tht develops within a vascular bundle

  fascicular cambium
• fascicular cambium is differentiated from?

  procambium
• vascular cambium that differentiates between vascular bundles in the interfascicular parenchyma

  interfascicular cambium
• interfascicular cambium differentiated from?

  parenchyma
• made up of ground tissue; connects cortex and pith

  pith ray
• designed to withstand pressure

  initials
• fusiform initials

  • gives rise to xylem and phloem
  • elongated and tapering
  • gives rise to the longitudinal and axial system of the plant body
• T/F. fusiform are stratified/storied or arranged in tiers

  True
• T/F. rays are stratified/storied or arranged in tiers

  False. Rays are non-stratified/non-storied or have overlapping ends
• what is the shape of the cork cambium initial

  tabular
• cork cambium

  • gives rise to inner phelloderm cells and outer phellem cells
  • has only one form of cell or initial
  • derivative is in a radial arrangement
• Ray initials

  slightly elongated too isodiametric; gives rise to the transverse system of plants
• Helianthus sp stem (young)

  • Smaller vascular bundles
  • larger pith
• Helianthus sp. stem (old)

  • larger vascular cambium
  • smaller pith
• dicot stems 


  have pith, forms circular rings
• dicot roots


  xylem forms an X pattern; no pith
• monocot stem

  vascular bundles are scattered
• monocot roots

  has a pith and circular vascular bundle
• T/F. Relative position of vascular cambium DOES NOT affect the organiziation of vascular plant bodies

  False. it affects the organization. When a plant undergoes secondary growth, the order of vascular bundles result in growth rings
• intercalary meristem

  • located at the base of internodes
  • lowermost region of leaf sheaths
• Characteristics of intercalary Meristem

  • not as big as adjacent cells
  • actively dividing cells
  • for elongation and growth
• intercalary meristem originated from what meristem?

  apical meristem
• intercalary means?

  inserted
• Epidermis

  • outermost layer of cells on the primary plant body
  • develop from the protoderm
  • have living protoplast
  • compact, uniseriate, covered with cuticle
• T/F. Epidermis remains in the secondary growth

  False. Epidermis becomes periderm
• epidermal cells vs underlying tissue cells

  • leaf: presence of cuticle
  • stem: uniform size & uniseriate while underlying cells vary in size
• epidermis in leaves has?

  guard cells, trichomes, stomata
• epidermis in stems have?

  lenticels
• epidermis in roots have?

  root hair
• epidermal cells: leaf cell arrangement and shape?

  Cell arrangement - tightly packed; no intercellular spaces

  Shape - flattened and elongated