NEET UG BIOLOGY MCQ: ORGANISMS AND POPULATION

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A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is

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Correct option: B

Zero

The correct answer is Zero (B) because the net increase is calculated by (natality + immigration) - (mortality + emigration), which equals zero in this case.

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Obligate parasites live on: Natality refers to You never see any cattle or goat browsing on Calotropis due to A species inhabiting different geographical area is known as In aquatic environment the types of benthic animals are determined by In an area there are 200 Parthenium and is single banyan tree. Which of the conculsion (s) is/are correct?
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III. In above cases the percentage of cover of biomass is more meaningful than population size