CH 229 Flashcards
(11 cards)
When did plants colonize land?
475 mya
Plant species
300,000 living spp. in almost all environments
Multicellular photoautotrophs
-chloroplasts with chlorophyll and other pigments
-celulose cell walls
-store starch for energy
What is the closest relative to plants?
Charophytes
Plants & Charophytes Shared Traits
-ring shaped complexes for cellulose synthesis
- structure of flagellated sperm
-& dna
What is sporopollenin?
-in spores & pollen
-prevents desiccation
-allows permanent terrestrial lifestyle
Benefits of land
-lots of light, CO2, soil nutrients
-few competitors & predators
Adaptations to land
-to absorb and transport water & minerals: roots and vascular tissue in some
-cuticle and stomata to prevent water loss
- to aid in repro success: spores and pollen, flowers, fruits, and seeds in some
-alt of gen
4 traits absent in Charophytes
-alternation of generations
-walled spores produced in sporangia
- multicellular, dependent embryo
-apical meristems
Apical meristems
Continual growth in stem and root of apical meristems that differentiate into tissues and organs
Non vascular seedless and & seedless vascular plants are monophyletic groups: true or false
false