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EOSC EXAM QUESTIONS WITH 100% CORRECT ANSWERS

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EOSC EXAM QUESTIONS WITH 100% CORRECT ANSWERS Which of the following would be the MOST effective way to cause a mass extinction today? A) Exterminate/kill the majority of the biota at the base of the food chain. B) Stop fertilizing farm land. C) Acidify major inland lakes. D) Cut down dec...

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  • November 19, 2024
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  • 2024/2025
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EOSC EXAM QUESTIONS WITH
100% CORRECT ANSWERS

Which of the following would be the MOST effective way to cause a mass extinction
today?
A) Exterminate/kill the majority of the biota at the base of the food chain.
B) Stop fertilizing farm land.
C) Acidify major inland lakes.
D) Cut down deciduous forests (those with trees that lose all of their leaves for part of
the year).
E) Exterminate/kill all top predators in North America. - Answer- Exterminate/kill the
majority of the biota at the base of the food chain.

All of the following likely caused the Permo-Triassic extinction EXCEPT ______. A)
decrease in continental biodiversity
B) loss of coastal and shallow water marine habitats
C) massive loss of marine life in anoxic oceans
D) greenhouse warming
E) global and massive deforestation - Answer- global and massive deforestation

Which of the following is TRUE about the Cretaceous-Paleogene extinction?
A) In general, all creatures heavier than 150 kg survived the extinction event.
B) Extinction was most severe on land compared to that in the oceans.
C) Species that initially survived the effects of the impact became extinct due to the loss
of the base of the food chain over a period of months.
D) The Cretaceous biosphere was very healthy up to the time of the K/Pg impact.
E) All species of dinosaurs became extinct. - Answer- All species of dinosaurs became
extinct.

What is the Oort cloud?
A) A cloud of nitric oxides that surrounded the Earth following large scale volcanic
events in the Deccan area of India.
B) A rapidly moving cloud of hot ash and gas that flows down the flanks of a
stratovolcano.
C) The cloud of carbon dioxide that surrounded the Earth following the K/Pg impact
event.
D) A spherical cloud of comets surrounding the solar system beyond the orbit of Pluto.
E) A cloud of debris between the orbits of Mars and Jupiter. - Answer- A spherical cloud
of comets surrounding the solar system beyond the orbit of Pluto.

, Which of the following is TRUE about the Cretaceous-Paleogene extinction? A) In
general, all creatures heavier than 150 kg survived the extinction event.
B) Extinction was most severe on land compared to that in the oceans.
C) Species that initially survived the effects of the impact became extinct due to the loss
of the base of the food chain over a period of months.
D) The Cretaceous biosphere was very healthy up to the time of the K/Pg impact.
E) All species of dinosaurs became extinct. - Answer- All species of dinosaurs became
extinct.

You're a paleontologist looking for evidence of an ancient global fire. Which of the
following would definitely point to one?
A) A sudden increase in fern spores relative to pollen
B) Lots of ferns in a forest
C) Sudden loss of ferns in tropical forests
D) Giant ferns of various ages
E) Extinction of fern-eating mammals - Answer- A sudden increase in fern spores
relative to pollen

Which of the following likely contributed to the significant increase in greenhouse gases
in the atmosphere in the Late Cretaceous?
A) Formation of limestone, CaCO3 in the oceans
B) Gases from farting dinorsaurs
C) Emission of volcanic gases
D) Chemical reactions which destroyed the ozone layer
E) Global-scale fires - Answer- Formation of limestone, CaCO3 in the oceans

What is the significance of evidence of high levels of iridium in Late Cretaceous
sediments?
A) It supports the idea that an extraterrestrial object collided with the Earth at that time.
B) It is proof that the Late Cretaceous biosphere was stressed by iridium contamination
prior to the K/Pg extinction.
C) It was evidence that large-scale earthquakes did not contribute to the K/Pg
extinction.
D) It proved that the K/Pg meteorite crater was in the Northern Hemisphere. E) It
supported the idea that global fires occurred in the Late Cretaceous, contributing to the
mass extinction. - Answer- it supports the idea that an extraterrestrial object collided
with the Earth at that time.

How is acid rain generated after a meteorite impact?
A) The very high heat melts pure sandstone to form sulphuric acid that gets released
directly into the atmosphere.
B) The blast causes nitrogen and oxygen to form oxides of nitrogen in the atmosphere
to form nitric acid.
C) Forest fires cause the flesh of animals to burn, releasing nitrogen-containing amino
acids to the atmosphere, producing nitric acid.

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