History of Life on Earth Flashcards
What is the earliest known form of life on Earth?
Prokaryotic microorganisms, such as bacteria.
True or False: The first multicellular organisms appeared during the Cambrian period.
True.
Fill in the blank: The _____ Theory explains the origin of eukaryotic cells.
Endosymbiotic.
Which era is known for the dominance of dinosaurs?
Mesozoic Era.
What significant event occurred approximately 66 million years ago?
The mass extinction event that led to the extinction of dinosaurs.
What is the significance of the fossil record?
It provides evidence of the history of life and evolution on Earth.
Which period is known as the ‘Age of Fishes’?
Devonian period.
True or False: Mammals first appeared during the Paleozoic Era.
False.
Multiple Choice: Which of the following is a characteristic of the Precambrian time?
A) Formation of Earth B) First signs of life C) Both A and B
What major development occurred during the Cambrian Explosion?
Rapid diversification of life forms.
Fill in the blank: The first land plants appeared in the _____ period.
Ordovician.
What is the primary cause of the Permian-Triassic extinction event?
Volcanic activity and climate change.
Which organisms are considered the ancestors of modern birds?
Theropod dinosaurs.
True or False: The Cenozoic Era is known as the ‘Age of Mammals.’
True.
What is the significance of stromatolites in the history of life?
They are among the oldest known fossils, providing evidence of early life.
Multiple Choice: Which of the following periods is part of the Mesozoic Era?
A) Jurassic B) Triassic C) Both A and B
What major evolutionary milestone occurred during the Carboniferous period?
The development of extensive forests and the evolution of amphibians.
Fill in the blank: The first mammals appeared during the _____ period.
Triassic.
What major environmental change occurred at the end of the Cretaceous period?
A significant drop in global temperatures and sea levels.
True or False: Homo sapiens first appeared during the Pleistocene Epoch.
True.
What is the significance of the K-T boundary?
It marks the mass extinction event that led to the demise of the dinosaurs.
Which group of organisms dominated the Earth during the Paleozoic Era?
Invertebrates.
Fill in the blank: The _____ is the geological time scale that outlines the history of Earth.
Geological time scale.
What role did plate tectonics play in the history of life on Earth?
It influenced the distribution of species and the formation of habitats.
