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level: Ecosystems of the Past and Human Impact

Questions and Answers List

level questions: Ecosystems of the Past and Human Impact

QuestionAnswer
Stomatal Atmospheric ConditionsThe density of stomata on leaf surfaces/fossils indicates CO₂ in atmosphere [increased CO₂ = increased stomata density] [Limited as few plants change stomatal density and different species have different stomatal density]
Ice Cores' Atmospheric ConditionsIce forms one layer per year; air is trapped in the ice, the trapped air can be measured and analysed
Ice Cores' Temporal ConditionsHigher abundance of Oxygen-18 [isotope] and Hydrogen-2; fewer heavy isotopes during colder periods
Habitat DestructionCreating dams, straightening rivers, clearing land, land+soil degradation [clearing land rises water level]
MonocultureForming uniform, same crop: reduces diversity heavily, genetic erosion
Selective BreedingForce mating between certain specimen: reduces genetic diversity
Genetic Modification"Superior" forms can be made; less variation amongst species
DiatomsBiodiverse algae, diversity increases when it's colder [can use fossils]
Ecosystems of the pastPollen fossilises easily. Diversity of pollen used to indicate diversity of the ecosystem