
Exploring the Purple Earth Hypothesis

Interactive Video
•
Biology, Science
•
7th - 12th Grade
•
Hard

Ethan Morris
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary reason chlorophyll appears green?
It reflects blue and red light.
It absorbs green light.
It absorbs all colors equally.
It reflects green light.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the Purple Earth Hypothesis?
A concept that purple light is the most efficient for photosynthesis.
A hypothesis that early photosynthesizers used a purple pigment.
A theory that Earth was once covered in purple plants.
A belief that Earth will turn purple in the future.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What pigment do halobacteria use to absorb light?
Carotene
Chlorophyll
Retinal
Xanthophyll
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key characteristic of halobacteria?
They live in extreme environments.
They produce large amounts of oxygen.
They are a type of bacteria.
They thrive in oxygen-rich environments.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why might chlorophyll have evolved according to the Purple Earth Hypothesis?
To produce more oxygen than other pigments.
To reflect more light and appear brighter.
To utilize light wavelengths not used by retinal-based organisms.
To absorb green light more efficiently.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a significant difference between chlorophyll and retinal?
Chlorophyll is more efficient at converting light into energy.
Chlorophyll is simpler than retinal.
Retinal absorbs more red light than chlorophyll.
Retinal is more complex than chlorophyll.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What event is known for increasing oxygen levels and affecting early microbes?
The Oxygenation Revolution
The Great Oxygenation Event
The Great Extinction Event
The Purple Earth Transition
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