Almost all of the oxygen gas in today's atmosphere is present as a result of a. outgassing from volcanoes. b. aerobic respiration. c. endosymbiosis. d. photosynthesis.

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Answer 1

Textbook Question

Chapter 18, Problem 1MC

Almost all of the oxygen gas in today's atmosphere is present as a result of

a. outgassing from volcanoes.

b. aerobic respiration.

c. endosymbiosis.

d. photosynthesis.

Expert Solution & Answer

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

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Answer 2

Textbook Question

Chapter 18, Problem 1MC

Almost all of the oxygen gas in today's atmosphere is present as a result of

a. outgassing from volcanoes.

b. aerobic respiration.

c. endosymbiosis.

d. photosynthesis.

Expert Solution & Answer

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

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Answer 3

Textbook Question

Chapter 18, Problem 1MC

Almost all of the oxygen gas in today's atmosphere is present as a result of

a. outgassing from volcanoes.

b. aerobic respiration.

c. endosymbiosis.

d. photosynthesis.

Expert Solution & Answer

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 18, Problem 1MC

Almost all of the oxygen gas in today's atmosphere is present as a result of

a. outgassing from volcanoes.

b. aerobic respiration.

c. endosymbiosis.

d. photosynthesis.

Expert Solution & Answer

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

Answer 8

Expert Solution & Answer

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

Introduction:

The earth is the only planet, which supports life and this is because of the presence of life-supporting environment. Prokaryotes is said to be the first organism originated billion years ago and survived by using available resources like hydrogen sulfide from volcanoes and carbon dioxide in the atmosphere. Photosynthetic bacteria performed anaerobic respiration as there was no oxygen in the atmosphere.

Answer 12

Answer to Problem 1MC

Correct answer:

Almost the entire amount of oxygen gas present in today’s atmosphere is due to photosynthesis.

Answer 13

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that photosynthesis is the source of almost all the oxygen present in today’s atmosphere. Photosynthetic bacteria used water (H₂O) to carry out the photosynthesis process and as a result, oxygen is released abundantly into the atmosphere. Carbon dioxide and water are used to produce carbohydrates where oxygen is released as one of the end products. Hence, option (d) is correct.

Explanation for incorrect answers:

Option (a) is given that outgassing from volcanoes is the source of oxygen content present in today’s atmosphere. As volcanoes erupt, outgassing provided the hydrogen required for photosynthesis process. But oxygen is not the end product when hydrogen sulfide from volcanoes is used. So, it is an incorrect option.

Option (b) is given that aerobic respiration is a process which breaks down complex substances in the presence of oxygen to result in simple substances in order to obtain energy. It is the process which uses oxygen and it does not release oxygen. So, it is an incorrect option.

Option (c) is given that endosymbiosis occurs when two organisms live in a harmonious relationship where one organism lives inside another organism. So, it is an incorrect option.

Hence, options, (a), (b), and (c) are incorrect.

Answer 14

Conclusion

Thus, it can be concluded that the abundant oxygen content in today’s atmosphere is due to the ability of organisms, which use water for photosynthesis and release oxygen as one of the products.

Answer 15

Ch. 18 - 1. Almost all of the oxygen gas in today’s...Ch. 18 - Extinction a. generally does not occur except...Ch. 18 - 3. In the endosymbiotic origin of the...Ch. 18 - 4. Which of the following does not list...Ch. 18 - Prob. 5MC Ch. 18 - 1. Because there was no oxygen in the earliest...Ch. 18 - 2. The molecule ________ became a candidate for...Ch. 18 - 3. Complex cells that contain a nucleus and other...Ch. 18 - 4. The sperm of early land plants had to reach the...Ch. 18 - 5. Early plants that protected their seeds within...

Almost all of the oxygen gas in today's atmosphere is present as a result of a. outgassing from volcanoes. b. aerobic respiration. c. endosymbiosis. d. photosynthesis.

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