I. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?
(a) Il is correct but I is false
(b) Both I and II are correct
(c) Both I and II are false
(d) I is correct but II is false
[NEET 2016, Phase 1]
Correct Option (b) Reason : The earliest organisms that appeared on earth were anaerobic chemoautotrophs.
Chemoautotrophs were the first autotrophic organisms. They were unable to perform photolysis of water and never released oxygen, e.g. sulphur bacteria.