LAB: Nonvascular Plants and Seedless Vascular Plants Flashcards Preview

Biology 2 > LAB: Nonvascular Plants and Seedless Vascular Plants > Flashcards

Flashcards in LAB: Nonvascular Plants and Seedless Vascular Plants Deck (8)
Loading flashcards...
1

Kingdom Plantae

  • Has cellulose in cell walls
  • all plants follow an alternation of generations life cycle
  • Under domain eukarya
  • All multicellular
  • Photosynthetic autotrophs

2

Alternation of Generations

  • plant possessing two stages during its life cycle
  • diploid (2n) sporophyte stage (produces sporangium)
  • haploid (1n) gametophyte stage (produces antheridia and archegonia)

3

Phylum Bryophyta

 

nonvascular plants (mosses and liverworts)

  • earliest transitional terrestrial plants
  • lacks vascular tissue (xylem and phloem)
  • are dependent upon diffusion and osmosis
  • Gametophyte dominant

4

Mosses 

  • all bryophytes start as a spore
  • develop into a thin filamentous stage called a  protonema
  • then develops into a gametophyte with root-like rhizoids
  • grows by mitosis into a multicellular sporophyte
  • base of sporophyte is anchored inside the archegonium by the foot with the seta (stalk) terminating in a capsule

5

Phylum Monilophyta

 

Ferns 

  • roots and a modified stem called a rhizome located underground
  • fronds ( compound leaves)
  • clusters of sporangia known as sori (sorus) form on the underside of fronds
  • Sporangia protected by a shield-shaped indusium
  • as a spore germinates, develops into a tiny, heart-shaped gametophyte called a prothallus (anchored by rhizoids)

6

Horsetails 

Equisetum

 

  • True roots, stem, leafs (reduced)
  • Strobili - clusters of sporangia
  • Spore elators -  dispersal mechanism of spores 

7

Phylum Lycophyta

Club Mosses

  • Specialized leafs - sporophylls
  • strobili - clusters of sporangia
  • mistaken for mosses
  • Include Lycopodium and Selaginella (resurrection plant)
  • most ancient group of vascular plants
  •  

8

Homospory vs. Heterospory

  • Homosporous - one spore (ex. ferns, horsetail, lycopodium)
  • Heterosporous - two spore (selaginella)
  • Produces megaspores (produced in megasporangium) 
    • female gametophytes that produce eggs in archegonia
  •  Produces microspores (produced in microsporangium)
    • male gametophytes that produce sperm within antheridia