Read the following statements and select the | vedclass

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(D) Statement $(a)$ is incorrect because population density can be measured in terms of biomass or percent cover,not just numbers.Statement $(b)$ is c

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$b$ & $d$

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(D) Statement $(a)$ is incorrect because population density can be measured in terms of biomass or percent cover,not just numbers.Statement $(b)$ is correct; in many cases,direct counting is difficult,so indirect methods like pug marks and fecal pellets are used for tiger census.Statement $(c)$ is incorrect because biomass is a very meaningful measure,especially when the population size is huge and counting individuals is time-consuming.Statement $(d)$ is correct because population size fluctuates due to changes in weather,food availability,predation pressure,and competition.Therefore,statements $(b)$ and $(d)$ are correct.

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