Before exam

Exam
Exam in FL51
15.15 - 17.15
12-16 question
Give extensive answers
Structure the answers as clearly as possible
Ecotoxicology:                 3-4
Ecosystem:                 3
Biodiversity                2
Water                                3
Energy:                                 3-4
Total: 14-16 questions
Structure of ecosystems
Organisms:
  • Eukaryotic
  • Prokaryotic (no well-defined DNA within the cell core)
Species
  • poplation
    · Habitat
    · Genetic diversity
    • Community
      • Ecosystem
        • Biosphere
Biomes                "part" of the terrestial biosphere
Aquatic life zones "part" of water biosphere
Biosphere:
  • Biotic
  • Abiotic
Function of ecosystems
Each population in an exosystem has a range of tolerance
Factors limiting population growth
on land:
               Precipitation
               Soil nutients
aquatic systems:
               Temp
               Nutritiants
               Dissolved oxygen content
               Salinity
Producers and consumers:
producers = autotrophs make their own food
land:
               green plants
water:
               algae, plants
open sea:
               phytoplankton
Most producers use photosynthesis, some chemosynthesis
consumers = hererotrphos feeding on other organisms
  • decomposers
  • omnicores
                   herbivores
                   carnovores
  • detrivores
Energy in glucose and other organic compounds released
By aerobic respiration (oxygen)
By anaerobic respiration (=fermentation)

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