Q. 245.0( 1 Vote )
(a) In a pond, th
(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.
Rate this question :