(B) Describe the history of life on Earth Explanation: The Geological Time Scale is primarily used to divide Earth's history into distinct intervals and describe the evolution of life forms that have existed on Earth.

(B) Mesozoic Era Explanation: The Mesozoic Era, which lasted from approximately 252 to 66 million years ago, is often referred to as the "Age of Reptiles" because it witnessed the dominance and diversification of reptiles, including dinosaurs.

(C) Eocene Epoch Explanation: The Eocene Epoch, which occurred between 56 and 33.9 million years ago, is known for the emergence of early primates, such as the ancestors of lemurs and tarsiers.

(A) The extinction of the dinosaurs Explanation: The boundary between the Cretaceous and Paleogene periods, known as the K-Pg boundary, is defined by a mass extinction event that led to the extinction of the dinosaurs and many other species.

(A) Eon Explanation: An eon is the largest division of geological time. It represents a major span of Earth's history and is subdivided into eras, periods, and epochs.

(B) The appearance of the first multicellular organisms Explanation: The Cambrian Explosion, which occurred around 541 million years ago, refers to a rapid diversification and appearance of various complex multicellular organisms in the fossil record.

(A) The diversification of mammals Explanation: The Quaternary Period, which began approximately 2.6 million years ago and continues to the present, is characterized by the diversification and success of mammals, including humans.

(D) The Permian-Triassic mass extinction Explanation: The boundary between the Paleozoic and Mesozoic eras is defined by the Permian-Triassic mass extinction, which was one of the most significant extinction events in Earth's history, resulting in the loss of about 96% of marine species.

(A) Complex life forms Explanation: The Proterozoic Eon, which spanned from approximately 2.5 billion to 541 million years ago, witnessed the emergence and diversification of complex life forms, including the first multicellular organisms.

(D) 90% Explanation: The Precambrian Era encompasses the vast majority of Earth's history, representing about 90% of the geological time scale, extending from the formation of Earth around 4.6 billion years ago to the beginning of the Cambrian Period.

(C) Cenozoic Era Explanation: The formation of the Himalayan mountain range took place during the Cenozoic Era, specifically in the Tertiary Period.

(A) Paleozoic Era Explanation: The first appearance of abundant complex life forms, including trilobites, is characteristic of the Paleozoic Era.

(B) Archean Eon Explanation: The "Great Oxidation Event" occurred during the Archean Eon, leading to the rise of atmospheric oxygen.

(B) Cretaceous Period Explanation: The extinction of the non-avian dinosaurs occurred at the end of the Cretaceous Period, precisely at the Cretaceous-Paleogene (K-Pg) boundary.

(B) Pleistocene Epoch Explanation: The "Ice Age" that occurred approximately 2.6 million years ago is part of the Pleistocene Epoch.

Geological Time Scale – Important MCQ

16. The first appearance of humans (genus Homo) falls within which epoch?

(A) Pleistocene Epoch
(B) Pliocene Epoch
(C) Miocene Epoch
(D) Holocene Epoch

(A) Pleistocene Epoch
Explanation: The first appearance of humans (genus Homo) falls within the Pleistocene Epoch.

17. The largest mass extinction in Earth’s history, responsible for the disappearance of about 96% of species, occurred at the end of which period?

(A) Permian Period
(B) Triassic Period
(C) Jurassic Period
(D) Cretaceous Period

(A) Permian Period
Explanation: The largest mass extinction in Earth’s history occurred at the end of the Permian Period and is known as the Permian-Triassic mass extinction.

18.The boundary between the Paleogene and Neogene periods is marked by which event?

(A) The extinction of the dinosaurs
(B) The formation of the Himalayas
(C) The first appearance of flowering plants
(D) The first appearance of mammals

(D) The first appearance of mammals
Explanation: The boundary between the Paleogene and Neogene periods is marked by the first appearance of mammals.

19. The “Snowball Earth” hypothesis suggests that Earth experienced:

(A) Extreme heatwaves throughout its history
(B) Global flooding events in the recent past
(C) Periods of extreme glaciation in the past
(D) Frequent volcanic eruptions in ancient times

(C) Periods of extreme glaciation in the past
Explanation: The “Snowball Earth” hypothesis proposes that Earth experienced prolonged periods of extreme glaciation in the past.

20. The Quaternary Period is divided into two epochs. These epochs are:

(A) Pleistocene and Pliocene
(B) Pliocene and Miocene
(C) Miocene and Holocene
(D) Holocene and Pleistocene

(D) Holocene and Pleistocene
Explanation: The Quaternary Period is divided into the Pleistocene Epoch and the Holocene Epoch.

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Geological Time Scale – Important MCQ

16. The first appearance of humans (genus Homo) falls within which epoch?

17. The largest mass extinction in Earth’s history, responsible for the disappearance of about 96% of species, occurred at the end of which period?

18.The boundary between the Paleogene and Neogene periods is marked by which event?

19. The “Snowball Earth” hypothesis suggests that Earth experienced:

20. The Quaternary Period is divided into two epochs. These epochs are:

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