Module 10 Flashcards
Photoautotrophy
Light energy organisms
Ingestive heterotrophy
Eats other organisms for energy
Absorptive heterotrophy
Obtains it’s foods by secretin g digestive enzymes into the environment to break down large food molecules then absorbing the breakdown products
Mixotrophy
Uses a mix of different sources of energy and carbon, instead of having a single trophic mode on the continuum from complete autotrophy at one end to heterotrophy at the other
Excavata
Eukaryote group: the euglenids
-Photosynthetic and heterotroph
-2 anterior flagellates
-light sensitive eyespot
-flexible cell wall (pellicle)
SAR (Stramenopila and alevolata)
Strsmenopila
- hairs on flagella, lost in some
-evolved when ancestor engulfed unicellular red algae (2 degree symbiosis)
Alevolata
-flattened alveoli under plasma membrane
Archaeplastida (rhodophyta, chlorophyta, charophyta)
The closest relatives to land plants
Red algae
Water lineages of green algae
Chl a masked by accessory pigments
Complex life cycles
Haplodiplontic life cycle
Sporophyte->4 spores->gametophyte->gametes->zygote->sporophyte
Seedless non vascular plants adaptations
-don’t have specialized conductive tissues
-limited growth potential
-simple and small
-need water for reproduction
-apical meristems
-multicellular embryos
-haplodiplontic life cycle
-multicellular sporangium
-multicellular gametangium
-epidermis specialized to conserve water
-adaptations for water transport
-secondary metabolites
Seedless no vascular plant water constrained. Why?
For reproduction bc of their flagellated sperm that swims to reach the egg
Seedless non vascular plant: gametangia location
Specialized organs for gamers formed: archegonium and antheridia
Sexual structures
Gametophyte dominance
Dominant life phase is the gametophyte
Moss life cycle
Haplodiplontic
