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ORGANISMS AND POPULATIONS 

IMPORTANT TERMS:

 ·         Adaptation: Structural and functional characteristics of organisms which enable them to survive and reproduce in a particular environment.

·         Aestivation: The state of some animals of spending dry hot period in an inactive state.

·         Camouflage: Matching of color of some animals with their surrounding so that they remain unnoticed by the prey or the predator.

·         Camouflage: The ability of some animals to blend with the surroundings.

·         Carrying Capacity: The maximum number of individuals which the environment can support or sustain.

·         Climate: Average weather of an area including general patterns of atmospheric seasonal variations and weather extremes.

·         Competition: The process in which the fitness of one species is significantly lower in the presence of another species.

·         Demography: The scientific study of human population.

·         Ecological Niche: The range of conditions that a particular organism can tolerate the resources it utilizes and its functional role in the ecological system.

·         Ecology: The study of reciprocal relationship between organisms and their environment.

·         Ectotherm (cold blooded animals): The animals, whose body temperature tends to match with the environmental temperature in which they live.

·         Emigration: The permanent movement of individuals out of a population.

·         Endotherm (Warm blooded animals): The animals, whose body temperature tends to match with the environmental temperature in which they live.

·         Environment: Surroundings in which organisms live.

·         Habitat: Place occupied by an organism/population/community which is exposed to particular combination of environmental factors.

·         Hibernation: The state of some animals of spending winter in dormant condition.

·         Home Range: An area where several members or breeding groups of a species roam about during search of food, water and mate.

·         Immigration: The permanent entry of individuals into a population from outside.

·         Migration: Movement of animals from one region to another with respect to food and weather at definite intervals which always include their return trip.

·         Mimicry: Refer to close resemblance of two species, in which the species palatable to its predator is called mimic and the species to which is resemble is called model.

·         Mimicry: The phenomenon of modification in a living organism so as to resemble with another organism or some non-living object to escape predation.

·         Mortality: The rate at which individuals die in a population.

·         Mutualism: An association of two species in which both species are benefited. It may or may not involve close physical association.

·         Natality: The rate at which new individuals are added to a population by reproduction.

·         Range of tolerance: Range/gradient of an environmental factor which determines the existence and abundance of an organism.

·         Resilense: The ability of population to tolerate changes in the environment.

·         Xerophytes: Plants of xeric habitat.

Mr. A. KINGSLIN M.Sc, BEd, Phd,(doing)
Post Graduate Teacher in Botany
St. Mary Goretty Hr. Sec School, Manalikarai 
Kanyakumari district





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