Biological Classification And System Of Classification Question 39
Question: Which were the organisms who changed earth?s surface from reducing to the oxidizing [BHU 2001]
Options:
A) Autotrophs
B) Heterotrophs
C) Photoautotrophs
D) Chemotrophs
Show Answer
Answer:
Correct Answer: C
Solution:
Cyanobacteria appeared in precambrian period around 3.2 billion years ago and were the first to have oxygenic photosynthesis to evolve $ O_2 $ in photosynthesis that caused conversion of primitive reducing atmosphere to present day oxidising atmosphere (oxygen revolution).
BETA
