Q. 245.0( 1 Vote )

(a) In a pond, th

Answer :

(a) Birth rate = a number of frogs added to the population in a given time/ total number of frogs initially present in the pond.

Birth rate = 40/200= 0.2 offspring per frog per year.

(b) Population in terms of number need not support all cases. If the population is huge and counting is impossible and time-consuming. For example:

• Consider an area with 200 parthenium plants and a single huge banyan tree. Even if the population density of the banyan tree is comparatively lower than Parthenium plants; the role played by a single banyan tree is much greater. In such case per cent cover or biomass is the best way to measure population size.

• Consider a petri dish with a culture of bacteria in a laboratory. Its impossible to take the count of bacteria and hence calculating absolute or relative population densities is the best way to determine the population size.

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