lecture 3 - coping w EV: energy Flashcards
autotrophs
assimilate radiant energy from sunlight or from inorganic compounds (photosynthesis)
heterotrophs
obtain their energy by consuming organic compounds from other organism
parasites and herbivores
consume live hosts, but do not necessarily kill them
predators
capture and consume live prey animasls
holoparasites
no photosynthetic pigments and get energy from other plants
eg dodder
photosynthesis
sunlight provides energy to take up co2 and synthesize organic compounds
chemosynthesis
energy from inorganic compounds is used to produce carbohydrates
important in nutrient cycling in bacteria
photosynthesis steps
light reaction
dark reaction
light compensation point
co2 uptake is balanced by co2 loss by respiration
saturation point
when photosynthesis no longer increases as light increases
3 types of photosynthesis
c3, c4, cam