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6.Evolution
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Given below some major events in the early history of life
$I.$ First heterotrophic prokaryotes
$II.$ First eukaryotes
$III.$ First autotrophic prokaryotes
$IV.$ First animals
Choose the correct sequence of these evolutionary events
A
$IV, III, II, I$
B
$I, III, II, IV$
C
$I, II, III, IV$
D
$IV, I, II, III$
Solution
Sequence of main steps during evolution
$(i)$ Free atoms
$(ii)$ Formation of simple organic molecules
$(iii)$ Formation of complex organic molecules
$(iv)$ Formation of eobionts
$(v)$ Formation of prokaryotes (various mode of nutrition)
$(vi)$ Formation of autotropic prokaryotes
$(vii)$ Formation of eukaryotes
$(viii)$ Formation of animals
Standard 12
Biology
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