10 Multiple Choice Questions - The Red Sea’s Scarlet Secret
1. What microscopic organism is responsible for the Red Sea’s color?
Plankton
Cyanobacteria (Trichodesmium erythraeum)
Coral
Seaweed
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2. Why is the Red Sea typically blue or turquoise?
Due to the water's mineral content
Its name is a historical reference
The cyanobacteria are usually blue-green
Due to shallow waters
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3. What color does Trichodesmium erythraeum appear during blooms?
Blue
Green
Red
Yellow
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4. What pigment gives Trichodesmium erythraeum its blue-green color?
Chlorophyll
Phycocyanin
Phycoerythrin
Xanthophyll
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5. Which pigment in Trichodesmium erythraeum causes a red tint?
Phycocyanin
Carotene
Phycoerythrin
Chlorophyll
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6. What environmental role does Trichodesmium erythraeum play?
Fixes nitrogen
Increases oxygen
Absorbs carbon
Produces sulfur
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7. What environmental condition can excessive blooms create?
Alkaline water
Hypoxic water
Highly acidic water
Clear water
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8. Why is nitrogen fixation important in the ocean?
It depletes nutrients
It releases oxygen
It supports marine life
It reduces sunlight penetration
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9. What historical figure likely gave the Red Sea its name?
Aristotle
Alexander the Great
Ancient locals
Marco Polo
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10. What is the main reason for the Red Sea’s name?
Frequent volcanic activity
Reflects coral reefs
Presence of red cyanobacteria blooms
Named after local culture
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