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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.
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Topics: Evolution
(132)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In case of poriferans the spongocoel is lined with flagellated cells called
- Uricotelic mode of passing out nitrogenous wastes is found in
- In the light of recent classification of living organisms into three domains
- Name the pulmonary disease in which alveolar surface area involved in gas exchange
- What would be the number of chromosomes of the aleurone cells of a plant with 42
Topics: Evolution (132)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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