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Introduction:
Scientists think that oxygen was absent from Earth’s early atmosphere until about 1.8 billion years ago. Any oxygen that appeared earlier than 1.8 billion years ago bonded with free iron ions. Evidence that iron oxide was formed by oxygen generated by early life is found in unique sedimentary rock formations which appeared as banded layers.
Answer to Problem 24A
Correct answer:
The correct answer is option A. photosynthetic autotrophs
Explanation of Solution
Explanation/justification for the correct answer:
Option A. photosynthetic autotrophs − Banded iron formations in sedimentary rocks are a result of cyclic peaks in oxygen production. Scientists believed that after 1.8 billion years ago, the Earth’s free ion was saturated with oxygen and oxygen then started to accumulate in the atmosphere. Banded iron formations suggest that photosynthetic autotrophs evolved after 1.8 billion years ago and they released oxygen into the atmosphere.
Hence this is the correct option.
Explanation for incorrect answer:
Option B. endosymbiont organelles − Banded iron formations suggest that photosynthetic autotrophs evolved after 1.8 billion years ago and they released oxygen into the atmosphere. Hence this is not the correct option.
Option C. heterotrophic prokaryotes- Banded iron formations suggest that photosynthetic autotrophs evolved after 1.8 billion years ago and they released oxygen into the atmosphere. Hence this is not the correct option.
Option D. heterotrophic eukaryotes − Banded iron formations suggest that photosynthetic autotrophs evolved after 1.8 billion years ago and they released oxygen into the atmosphere. Hence this is not the correct option.
Chapter 14 Solutions
EP BIOLOGY 2012-STUDENTWORKS ONLINE
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