Q.. (a) Name the group of bacteria the presence of which confirms the contamination of water of a river. (6) Write one negative effect of affluent lifestyle of few persons on the environment. (C) List two items which can easily be recycled, but we generally throw them in the dustbins.​

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.