CBIOL 1101 F19 <CUSTOM> BIOLOGY: CONCEP
CBIOL 1101 F19 <CUSTOM> BIOLOGY: CONCEP
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ISBN: 9781307475357
Author: Hoefnagels
Publisher: MCG/CREATE
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Textbook Question
Chapter 15, Problem 1MCQ

Place the following events in Earth’s history in order. Which happened second?

a. Eukaryotes arose.

b. O2 gas accumulated in the atmosphere.

c. First multicellular organisms arose.

d. Prokaryotes arose.

Expert Solution & Answer
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Summary Introduction

Introduction:

The earth and other planets of the solar system formed around 4.6 billion years ago. The earth was a red-hot ball at that time and it slowly cooled down to form the crust. The earth cooled down further to allow the origin of first life form on earth. The changes in atmosphere of earth such as accumulation of oxygen took place gradually to allow origin of other life forms on earth.

Answer to Problem 1MCQ

Correct answer:

Accumulation of oxygen gas in the atmosphere is the second event to occur in the history of Earth. Therefore, option (b) is correct.

Explanation of Solution

Reason for the correct statement:

Prokaryotes arose around 4.23.8 billion years ago in the Precambrian supereon period. On the other hand, the accumulation of oxygen in the atmosphere began around 2.5 billion years ago, much later than origin of prokaryotes. The eukaryotes arose around 1.5 billion year ago followed by the evolution of multicellularity.

Option (b) is given as “ O2 gas accumulated in the atmosphere”.

As, “the accumulation of oxygen in the atmosphere constitute the second event to occur in Earth’s history in order”, is the right answer.

Hence, option (b) is correct.

Reasons for the incorrect statements:

Option (a), is given as “Eukaryotes arose”.

Eukaryotes arose around 1.5 billion years ago and this event is the third event in Earth’s history in order. Hence, it is a wrong answer.

Option (c), is given as “First multicellular organisms arose”.

First multicellular organism originated around 1.2 billion years ago and this event is the fourth event in Earth’s history in order. Hence, it is a wrong answer.

Option (d), is given as “Prokaryotes arose”.

The prokaryotes arose around 4.23.8 billion years ago and this event is the first event in the Earth’s history in order. Hence, it is a wrong answer.

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

Conclusion

Accumulation of oxygen in the atmosphere is the second event to occur in the history of Earth.

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Students have asked these similar questions
Which of these steps probably occurred first in the chemical andbiological evolution of life?a. The cell membrane of a protobiont formed.b. The first organic molecules formed.c. The original genetic material was RNA.d. Simple organic monomers formed from inorganic materials.
Place these events in the history of life on Earth in the order that they occurred. a. accumulation of O2 in Earth’s atmosphere b. colonization of land by plants and fungi c. diversification of animals (Cambrian explosion) d. origin of eukaryotes e. origin of humans f. origin of multicellular organisms g. origin of prokaryotes
What event is thought to have contributed to the evolution of eukaryotes? a. global warming b. glaciation c. volcanic activity d. oxygenation of the atmosphere

Chapter 15 Solutions

CBIOL 1101 F19 <CUSTOM> BIOLOGY: CONCEP

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