Multiple Choice
In aquatic environments, the photic zone is typically about how deep?
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48. Ecology
Introduction to Aquatic Biomes
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Which of the following organisms must always stay submerged in seawater?
A
Mangrove trees
B
Sea turtles
C
Seagulls
D
Coral polyps
Verified step by step guidance1
Understand the habitat requirements of coral polyps. Coral polyps are marine organisms that form coral reefs and require specific conditions to survive.
Recognize that coral polyps are sessile organisms, meaning they are fixed in one place and do not move. They attach themselves to substrates in the ocean.
Coral polyps rely on a symbiotic relationship with zooxanthellae, which are photosynthetic algae. These algae need sunlight to perform photosynthesis, which is why coral polyps are found in shallow, sunlit waters.
Coral polyps extract calcium carbonate from seawater to build their hard exoskeletons, which form coral reefs. This process requires them to be submerged in seawater continuously.
Compare coral polyps with the other organisms listed: Mangrove trees, sea turtles, and seagulls. These organisms can survive outside of seawater for periods of time, unlike coral polyps, which must remain submerged to maintain their physiological processes.
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