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In the primitive atmosphere which was not available in free state?
Options
(a) CH₄
(b) H₂
(c) O₂
(d) H₂O
Correct Answer:
O₂
Explanation:
The early atmosphere was without free oxygen, so atmosphere was reducing in nature. It only contained hydrogen, methane, ammonia and water vapours. At present free oxygen is present so atmosphere is oxidising in nature.
Related Questions: - Algae have cell wall made up of
- A terrestrial animal must be able to
- Adjacent cells are interconnected by
- Photoperiodism was first characterised in:
- Vertical distribution of different species occupying different levels in a biotic
Topics: Evolution
(132)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Algae have cell wall made up of
- A terrestrial animal must be able to
- Adjacent cells are interconnected by
- Photoperiodism was first characterised in:
- Vertical distribution of different species occupying different levels in a biotic
Topics: Evolution (132)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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