population increases the number of predators will predation will take place the prey population will be reduced. y population decreases the number of predators will decrease 

ator-prey cycle therefore, helps in maintaining the ecosystem 

on The population of rabbits when first introduced in Australia rapidly 

th go large that it created a menace. Why? Because no predators were 

, t and hence there was no check on their population. Predator were ced to counter the situation. 

predator-prey relationship is an effective tool for the biological control population of various organisms. 

Competition: This type of a relationship is actually a “cold war’ between the ‘sms of a community occupying the same habitat. The competition e intraspecific (between the individual of the same species) or + # 1c (between the individuals of the different species). This competition for food, mate or simply for the sake of living space. This competition es a limiting factor and ends in the survival of the fittest and keeps 

of community in balance. « Ue 

Symbiosis: " a yy“ ae 

It is an association between the two organisms of the different species, 

start living together. They are mutually benefited or at least one nefit but the other is neither benefited nor harmed. This symbiotic o «tion is of two types the mutualism and commensalism. 

1. “ om: \ ~~ K 

In mutualism two different kinds of organisms get benefit from living olher. In most of these cases they cannot live without each other. .¢, es for example, eat wood but cannot digest its main component the itlose. Small unicellular flagellate protists ( Protozoa ) living in their al tine digest this cellulose for them. The termite is thus provided with 

e®eans of digestion, in return protists are given a safe place to live. will starve to death if these protists are removed from their intestine. 

Anotherscommon example is of insects who pollinate the flowers as 

§ nectar from them. S ¢ 

Cy 

usalism : is a relationship in which one of the organism, the commensal, 

fit wher ' neither benefited nor harmed, A good