Question:
Arrange the following in sequence in relation to the origin of living organisms
A. Chemo-autotrophs
B. Oxygenic photoautotrophs
C. Anaerobic heterotrophs
D. Anoxygenic photo-autotrophs
Arrange the following in sequence in relation to the origin of living organisms
A. Chemo-autotrophs
B. Oxygenic photoautotrophs
C. Anaerobic heterotrophs
D. Anoxygenic photo-autotrophs
A. Chemo-autotrophs
B. Oxygenic photoautotrophs
C. Anaerobic heterotrophs
D. Anoxygenic photo-autotrophs
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Order: Anaerobic heterotrophs → Chemoautotrophs → Anoxygenic → Oxygenic photoautotrophs.
Updated On: May 12, 2025
- A, C, D, B
- B, A, D, C
- C, A, D, B
- D, C, B, A
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The Correct Option is C
Solution and Explanation
- First life forms were anaerobic heterotrophs (no oxygen).
- Chemoautotrophs appeared next, using inorganic chemicals.
- Then came anoxygenic photoautotrophs (photosynthesis without oxygen release).
- Finally, oxygenic photoautotrophs evolved, contributing oxygen to atmosphere.
- Chemoautotrophs appeared next, using inorganic chemicals.
- Then came anoxygenic photoautotrophs (photosynthesis without oxygen release).
- Finally, oxygenic photoautotrophs evolved, contributing oxygen to atmosphere.
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