Origin and Evolution of Plants Flashcards
Characteristics of all plants
- Eukaryotic
- Multicellular
- Photoautotrophic
Classification
- non-vascular plants
- vascular plants
Non-vascular plants example
- bryophytes - mosses
Vascular plants categories
- non-seed plants
- seed plants
non-seed plants example
- ferns
- horsetails
- club mosses
seed plants example
- cycads
- ginkgo
- gymnosperms
- angiosperms
Plants require what?
- water for fertilization
- except seed plants
Who are dominant photosynthetic group?
Vascular plants
List timeline of Origin of plants
- prokaryotes (bacteria/archaeans)
- Photosynthesis –> prokaryotic cyanobacteria
3.Organelles evolved –> DNA in nucleus - Eukaryotes diversified
some gain mitochondria, some gain chloroplasts
What was chloroplasts through?
endosymbiosis
Eukaryotes with mitochondria evolved. . .
protozoans
fungi
animals
Eukaryotes with mitochondria & chloroplasts evolved. . .
plants
algae
growing evidence
highly integrated organisms
- structure and metabolism
(impact rest of plant)
- adaptation in one part –> change to another part
Cell Theory
- plant collection of cells
- cellular building blocks for development
Organismal Theory
-plant cells communicate, interact, and influence each other
- cellular subdivision
- based on plasmodesmata and symplast
What are Plasmodesmata (PD)?
- key to development of multicellularity in plants
- communication & interaction between adjacent plant cells within a plant
PD or no PD for Land plants (grasses)?
PD
PD or no PD for Land plants (Vascular)?
PD
PD or no PD for Land plants (Bryophytes)?
PD
PD or no PD for zygnematales?
No PD
PD or no PD for Coleochaetales?
PD
PD or no PD for Charales?
PD
PD or no PD for Klebsormidiales?
no PD
PD or no PD for Chlorokybales?
no PD
PD or no PD for mesostigmatales?
no PD
Influence of Plasmodesmata?
- cell differentiation
- tissue formation
- organogenesis
- special physiological functions
examples of bryophytes
- liverworts
- hornworts
-mosses
Vascular plants
- seedless
- seed
example Seedless vascular plants
-lycophytes
- pterophytes
example of seed plants
- gymnosperms
- angiosperms
Most diverse group
angiosperms = flowering plants
what do plants supply and use?
Supply O2
use CO2
provide to who?
animals on land
Stress - more temperature extremes
Solution?
stomata controlled by guard cells
Stress - reduced water availability
Solution?
- development of xylem, roots/rhizoids
- presence of sporopollenin (in spores)
- protected gametangia/gametes