Introduction:
The atmosphere of the primitive Earth almost lacked oxygen and contained other gases like ammonia, methane, water, and hydrogen. Among these gases, hydrogen was very predominant and most reactive. These gaseous molecules combined to form various metabolites like
Answer to Problem 1MCQ
Correct answer:
Carbon-dioxide gas appeared in the early atmosphere, which was used for performing photosynthesis along with light energy. Therefore, option d. is correct.
Explanation of Solution
Reasons for the correct statement:
Option d. is given as “
Hence, option d. is correct.
Reasons for incorrect statements:
Option a. is given as “Membrane-enclosed structures developed”. The membrane-enclosed structures developed according to the endosymbiont theory, which led to the formation of bacteria with double membrane organelles like mitochondria and chloroplast. Hence, option a. is incorrect.
Option b. is given as “
Option c. is given as “organic molecules formed”. Oparin-Haldane theory explains that the early Earth had an illegible atmosphere with reduced oxygen content. The formation of organic molecules from initial gases like ammonia, methane, and water occurred very slowly. This shows that the organic molecules are not found in the early Earth. Hence, option c. is incorrect.
Hence, options a., b., and c. are incorrect.
Conclusion:
The events that occurred during the Earth’s history included the presence of carbon-dioxide gas in the primitive atmosphere.
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Chapter 15 Solutions
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