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WorksheetsChapter 14, Sections 1 & 2. Science 9
Total questions: 15
Worksheet time: 7mins
What is represented in the geologic time scale?
Fossil formation in sedimentary rock
Steps of endosymbiosis
Major geological & biological events in Earth's history
Current plant & animal groupings
Evidence of past life in the form of fossils is found in what form of rock?
Sedimentary
Metamorphic
Igneous
Crushed metamorphic rock
On a field trip, a scientist finds a fossil of a snub-nosed crocodile & wants to know its age. What would you do to date the fossil?
Measure decay of radioactive isotopes in the rock around the fossil
Count the annual rings of trees growing in the area
Determine the age by comparing it to fossils in other layers
Measure the depth at which the fossil is found
What is one advantage of radiometric dating over relative dating?
Radiometric dating can be performed in the field
Radiometric dating can be performed by students
A Geiger counter (instrument to detect radioactivity given off by objects or materials) can be used
The age of an isolated rock can be determined
During which time in geologic history is Earth thought to have formed & life first appear?
Cenozoic Era
Jurassic Period
Precambrian
Cretaceous Period
Why does the presence of iridium support the idea that a meteorite struck Earth, possibly bringing about a mass extinction at the end of the Mesozoic period?
Records of the period show a cloudy atmosphere for months at a time
Iridium is rare on Earth but common in meteorites
Rocks show a 100 percent increase in iridium at that time
There was an increase in species
What is known about mass extinctions?
They are common
They occur instantaneously
They wipe out all organisms
They occur every several million years
Fossils of a seed fern were found on several different continents, each with a different climate. What does this evidence support?
Spontaneous generation
Endosymbiosis
Continental drift
Theories about the development of Earth's atmosphere
What characteristics do scientists hypothesize about the first forms of life?
They were prokaryotes linked with volcanic environments
They were autotrophic & able to feed themselves because they contained chlorophyll
They were prokaryotes that breathed oxygen
They were aerobic
Which is the most accurate statement about eukaryotic cells & how their organelles evolved?
Mitochondria & chloroplasts are parasites in cells
Prokaryotes might have entered host cells as prey or parasites
Eukaryotic cells evolved before prokaryotes
Mitochondria & chloroplasts look similar
What did Francesco Redi's experiments disprove?
The law of superposition
The Cambrian explosion of life
The endosymbiont theory
The theory of spontaneous generation
What did Pasteur's experiment with sterile broth show?
Only living things can produce other living things
Organic molecules could be produced from gases
Meteorites brought the first organic molecules to Earth
Organic reactions in deep-sea volcanic vents preceded life's emergence
The primordial soup hypothesis states that energy from sunlight & lightning allowed the first organic molecules to form
True
False
The theory of biogenesis states that only living organisms can produce other living organisms
True
False
It was Stanley Miller & Harold Urey who simulated early atmospheric conditions to test the primordial soup hypothesis
True
False
