Biodiversity is defined as the richness of the living systems present at all the levels of biological organization . The biodiversity consists of genetic variation within a population and between the populations at the basic level.

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Answer 1

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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Students have asked these similar questions

A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation? The cell membranes are more resistant than normal. An isotonic solution had been added instead of water. A solution of 0.1 M NaCl had been added instead of water. Not enough water had been added to the red blood cell pellet. The man had sickle-cell anaemia.

With reference to their absorption spectra of the oxy haemoglobin intact line) and deoxyhemoglobin (broken line) shown in Figure 2 below, how would you best explain the reason why there are differences in the major peaks of the spectra? Figure 2. SPECTRA OF OXYGENATED AND DEOXYGENATED HAEMOGLOBIN OBTAINED WITH THE RECORDING SPECTROPHOTOMETER 1.4 Abs < 0.8 06 0.4 400 420 440 460 480 500 520 540 560 580 600 nm 1. The difference in the spectra is due to a pH change in the deoxy-haemoglobin due to uptake of CO2- 2. There is more oxygen-carrying plasma in the oxy-haemoglobin sample. 3. The change in Mr due to oxygen binding causes the oxy haemoglobin to have a higher absorbance peak. 4. Oxy-haemoglobin is contaminated by carbaminohemoglobin, and therefore has a higher absorbance peak 5. Oxy-haemoglobin absorbs more light of blue wavelengths and less of red wavelengths than deoxy-haemoglobin

Answer 2

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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Answer 3

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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Answer 4

Question

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

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

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Answer 6

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Answer 7

Chapter 55, Problem 1TYK

Summary Introduction

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Answer 8

Expert Solution & Answer

Answer to Problem 1TYK

Correct answer:

The greatest extinction in the history of life on the earth might be occurring now.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Justification for the correct answer:

Option (e) states that ‘the greatest extinction on the earth may be occurring now.’ The biodiversity is now declining rapidly. It is occurring much faster than it might have occurred in the history of the earth. The reasons behind the greatest extinction are threats to the biodiversity. There are three major threats to biodiversity, namely deforestation, over-exploitation of fish population, and alteration of freshwater ecosystems. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) states that ‘the greatest extinction on the earth occurred at the end of the Permian period.’ The Permian period ended with a Permian–Triassic extinction event, in which nearly 96% of the marine species and 70% of the terrestrial vertebrates became extinct. The present day extinction is going at a faster pace than the Permian period’s extinction. So, it is an incorrect option.

Option (b) states that ‘the greatest extinction on the earth occurred at the end of the Cretaceous period.’ The Cretaceous period ended with the event of Cretaceous–Paleogene extinction, which led to the non-avian dinosaurs, large marine reptiles, and pterosaurs extinction. It is still not the greatest extinction in the history of the earth. So, it is an incorrect option.

Option (c) states that ‘at the end of the Ordovician period, the greatest extinction occurred on the earth.’ The Ordovician period ended with the Ordovician–Silurian extinction event, which led to the extinction of invertebrates including mollusks and arthropods. This did not end with mass extinction. So, it is an incorrect option.

Option (d) states that ‘the greatest extinction took place at the end of the Cambrian era.’ The Cambrian era ended with the Cambrian–Ordovician extinction event, in which many brachiopods and conodonts got extinct. The greatest extinction did not take place at the end of this era. So, it is an incorrect option.

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

Answer 12

Conclusion

Thus, it can be concluded that the greatest extinction might be occurring now and did not take place at the end of the Permian, Cretaceous, Ordovician, and Cambrian era. The current extinction is taking place due to human activities.

Answer 13

Ch. 55.1 - Prob. 1SB Ch. 55.1 - Prob. 2SB Ch. 55.1 - Prob. 3SB Ch. 55.2 - Prob. 1SB Ch. 55.2 - Prob. 2SB Ch. 55.3 - How does biodiversity serve as a storehouse of...Ch. 55.3 - Prob. 2SB Ch. 55.4 - Prob. 1SB Ch. 55.4 - Prob. 2SB Ch. 55.4 - Why are conservation biologists especially...

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization . The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Concept explainers

Videos

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Answer to Problem 1TYK

Explanation of Solution

Want to see more full solutions like this?

Chapter 55 Solutions

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization . The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Concept explainers

Videos

Introduction: Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.

Answer to Problem 1TYK

Explanation of Solution

Want to see more full solutions like this?

Chapter 55 Solutions

Introduction:

Biodiversity is defined as the richness of the living systems present at all the levels of biological organization. The biodiversity consists of genetic variation within a population and between the populations at the basic level.