Evolution Question 12
12. Following are the two statements regarding the origin of life
[2016]
(A) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(B) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?
(a) (A) is correct but (B) is false.
(b) (B) is correct but (A) is false.
(c) Both (A) and (B) are correct.
(d) Both (A) and (B) are false.
Show Answer
Answer : c
Hints & Solution
(c) Both statements are correct because primitive atmosphere was reducing and chlorophyllappearedlater on. Chemoautotrophs were the first autotrophic organisms unable to perform photolysis of water and never released oxygen.
