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population regulationthe number of individuals in a natural population varies with time if the size of a population declines too drastically due to
factors affecting biotic potential - population growthbiotic potential differs from one species to another eg bacterial populations can grow faster
population growth - population parameters and regulationthe size of a population depends upon the balance between natality and immigration through
age distribution - population parameters and regulationit is obvious that individuals in a population will be of different age groups relative
migration - population dispersaldispersal is affected by the presence or absence of the barrier and vagility which means inherent power of movement
mass dispersal - population dispersal a population is inherently dynamic in nature since individuals are always leaving or entering the populations
population dispersal population dispersal is the movement of individuals into or out of the population or the population area it occurs in three
mortality - population parameters and regulationthe death of an individual in a population is known as mortality mortality rate like natality
natality rate - natalitynatality rate or birth rate is determined by dividing the number of individuals born by unit time and is expressed as
natality - population parameters and regulationnatality is the ability of a population to increase natality rate is equivalent to birth rate which
density - population parameters and regulationdensity is defined as number of individuals or population biomass per unit of area or volume at any
population parameters and regulationpopulation can be defined as a group of organisms of same species occupying a specific area at a particular time
crustose lichen stage - xerarchon bare rocks conditions are inhospitable for life as there is extreme deficiency of water and nutrients great
foliose lichen stage - xerarchas mentioned earlier the weathering of the rocks and the decaying of the crustose lichens results in the formation of
moss stage - xerarchthe accumulation of soil particularly in the crevices and depressions of rock favours the growth of certain xerophytic mosses eg
herb stage - xerarchthe soil-forming and soil-holding reactions of the mosses are so pronounced that the seeds of various xerophytic herbs especially
shrub stage - xerarchsufficient soil is formed in the herbs stage for supporting the woody plants or the shrubs they migrate with the help of seeds
climax forest - xerarchfirst some xerophytic species of trees establish in this area they are sparsely distributed and are stunted because the
changes in animal life during xerosere just like the hydrosere there occur successive changes in animal life during the xerosere a few mites are
xerarch - ecologysuccessions initiated on bare rock wind-blown sand rocky talus slopes or other situations where there is an extreme deficiency of
successive changes in animal life during hydrosere the successive changes in plant communities in the different seral communities of a hydrosere the
climax stage - hydrarcha variety of trees invade the woodland community which soon develop into the climax community the nature of the climax is
woodland stage - hydrarchwhen the lowland has been built up to an extent where the soil is saturated perhaps only in spring and early summer certain
sedge-meadow stage - hydrarchfavoured by an increasing amount of light as the former occupants disappear they gradually change the reed swamp into a
reed-swamp stage - hydrarchthis stage is also known as amphibious stage as the plants of the community are rooted but most parts of their shoots