WorksheetsTOPIC 6 DAY 1 EARTH IS UNIQUE
Total questions: 6
Worksheet time: 12mins
One of the accepted scientific theories describing the origin of life on Earth is known as chemical evolution. According to this theory, which of the following events would need to occur first for life to evolve?
The onset of photosynthesis
The origin of genetic material
The synthesis of organic molecules
The formation of the plasma membrane
Which types of organisms developed first due to the early environmental conditions on Earth?
prokaryotic, aerobic, and heterotrophic
prokaryotic, anaerobic, and autotrophic
eukaryotic, anaerobic, and heterotrophic
prokaryotic, anaerobic, heterotrophic
Earth's atmosphere today is very different from its early atmosphere. Which of the following processes changed Earth's early atmosphere to its current form?
Release of water vapor and carbon dioxide by volcanoes
Formation of amino acids from simple nonliving molecules
Photosynthesis by cyanobacteria
Cellular respiration by eukaryotic cells
The early Earth had many active volcanoes, which contributed to the atmosphere. How did the early atmosphere differ from Earth’s atmosphere today?
The early atmosphere contained more oxygen, which was harmful to many organisms.
The early atmosphere contained far less oxygen, but higher levels of other toxic gases.
The early atmosphere contained more water vapor and enough oxygen to support life.
The early atmosphere contained far less carbon monoxide, carbon dioxide, methane, and ammonia.
Which is NOT considered a possible location on primitive Earth where conditions would have allowed the synthesis of complex organic compounds?
near volcanoes
dry, hot deserts
deep ocean vents
shallow seashores
A theory is a set of related hypotheses that have been tested and confirmed many times by many scientists. Which of the following could cause a long-held theory to be challenged or even overturned by the scientific community?
New evidence that better matches the new theory than previous evidence
A popular celebrity who disagrees with the ideas outlined in the old theory
A scientist who has strong beliefs that the old theory is wrong but little evidence
A group of scientists who believe that new theories are usually better than old theories
