KEY POINTS ORGANISMS AND POPULATION PART 1

XII	Topic:  ORGANISM AND POPULATION
QUESTIONS	NOTES
	Ecology: study of interactions among org., n b/w its phy/abiotic env
	4 levels: organisms <  population <  communities < biomes
	At org level – physiological (adaptations for survival n reproduction) along course of evolution thru nat selection… adaptations developed
	Biome formation: rotation of sun leading to temp variations, seasons, precipitation
	Major Biomes: Desert, Grassland, Tropical, Temperate n Coniferous forests, Arctic n Alpine Tundra
	Habitat: Regional & local variation
	*Intestine (habitat for 100s of microbes)
	Habitat determined by:
	Temp: variations due to season, altitude, altitude.             Range sub 0 - >50 deg C Excep: thermal springs, deep sea hydrothermal vents (temp upto 100 deg C)
	Impact of temp on: enzyme Kinetics  Basal Metabolism Physiological functions