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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Question

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Answer 1

Question

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Expert Solution & Answer

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 “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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

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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Answer 2

Question

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Expert Solution & Answer

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 “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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

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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Answer 3

Question

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Expert Solution & Answer

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 “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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

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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Answer 4

Question

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Expert Solution & Answer

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 “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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

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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Answer 5

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Expert Solution & Answer

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 “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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

Conclusion:

The events that occurred during the Earth’s history included the presence of carbon-dioxide gas in the primitive atmosphere.

Answer 6

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Expert Solution & Answer

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 “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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

Conclusion:

The events that occurred during the Earth’s history included the presence of carbon-dioxide gas in the primitive atmosphere.

Answer 7

Chapter 15, Problem 1MCQ

Summary Introduction

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 nucleotides and amino acids. The other gases present in the air during that time included carbon dioxide. This gas was utilized by the early species of photosynthetic bacteria and archaebacterial cells for the process of photosynthesis that occurred with the help of light energy. Due to photosynthesis, the early Earth began to be enriched with oxygen.

Answer 8

Expert Solution & Answer

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.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Reasons for the correct statement:

Option d. is given as “CO2 gas appeared in the atmosphere”. Carbon-dioxide gas was evolved from the volcanoes in the previous atmosphere. The primitive Earth formed from the hot gases and solids; carbon dioxide was the first gas found in the primitive atmosphere.

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 “O2 gas accumulated in the atmosphere”. Oxygen gas evolved as a result of photosynthesis of bacteria leading to the release of this gas as a waste product. Hence, option b. is incorrect.

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.