Botany · 2013
NEET 2013 · 5 May · Code W · Q176
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and…
A biologist studied the population of rats in a barn. He found that the average natality was $\displaystyle 250$, average mortality $\displaystyle 240$, immigration $\displaystyle 20$ and emigration 30. The net increase in population is :
Official answer
(4)
zero
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NEET (UG) 2013 Botany question, with the answer from NTA’s final answer key. Where our answers come from.