OCE ch 15 Questions with Correct Answers (Grade A+)
Question 1: The three varieties of seeps on the seafloor include hypersaline, hydrocarbon and:
Answer: subduction zone seeps
Question 2: Which of the following environments supports chemosynthesis? Choose all that apply.
Answer: -subduction zones where methane from the decomposition of organic material in folded
sedimentary rocks trickles from the sea floor -mid-ocean ridges associated with black smokers -areas where
high-salinity waters percolate from the sea floor -hydrocarbon seeps that emit methane
Question 3: The amount of life on the ocean floor depends primarily on _________.
Answer: the productivity of the surface layer above it
Question 4: The water pressure at the mid-ocean ridges exceeds ________ times greater than
atmospheric pressure at sea level.
Answer: 200
Question 5: In the deep ocean, mud like clay deposits are found on the ________.
Answer: abyssal plains and deep trenches
Question 6: On the diagram of rocky-shore tide zones shown below, use the organisms present to match
each letter to the correct tide zone. Match the words in the left column to the appropriate blanks in the
sentences on the right. Make certain each sentence is complete before submitting your answer.
Answer: 1. B: Low tide zone 2. A: Middle tide zone 3. C: Spray zone 4. D: High tide zone
Question 7: On the diagram below, match the correct letter to each of the following features of a sea
anemone. Match the words in the left column to the appropriate blanks in the sentences on the right.
Make certain each sentence is complete before submitting your answer.
Answer: 1. D: Gut 2. E: Trigger 3. C: Cnidoblast 4. A: Mouth 5. B: Nematocyst
Question 8: The diagram below shows tide zones in a sediment-covered shore. Use the letters to match
the tide zones shown in the figure with the correct representative organisms. Match the words in the
left column to the appropriate blanks in the sentences on the right. Make certain each sentence is
complete before submitting your answer.
Answer: 1. C: Sand dollar 2. D: Ghost shrimp 3. B: Ghost crab 4. E: Sand star 5. A: Bristle worm
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, Question 9: The diagram below shows the structure of the giant brown bladder kelp (Macrocystis).
Match each letter with its correct structure on the kelp. Match the words in the left column to the
appropriate blanks in the sentences on the right. Make certain each sentence is complete before
submitting your answer.
Answer: 1. B: Pneumatocyst 2. C: Blade 3. D: Holdfast 4. A: Stipe
Question 10: Use the letters on the diagram below to match the coral types with the depth zones in
which they live. Match the words in the left column to the appropriate blanks in the sentences on the
right. Make certain each sentence is complete before submitting your answer.
Answer: 1. A: Delicate plate corals 2. B: Massive branching corals 3. D: Massive head corals 4. C: No coral
grows here
Question 11: Which of the following are not a species found in hydrothermal vent biocommunities?
Answer: corals
Question 12: Symbiotic archaea that live inside tubeworms can use two different methods to metabolize
________ and can switch back and forth to accommodate fast-changing environmental conditions.
Answer: carbon dioxide
Question 13: Which of the following hydrothermal vent fields builds chimneys of calcium carbonate,
instead of the metal sulfides found at typical black smokers?
Answer: lost city
Question 14: The primary producers in chemosynthetic vent communities are _________.
Answer: archaea
Question 15: Recent studies indicate that the deep biosphere, an environment that exists within the
seafloor itself, may account for up to _________ of Earth's total bacterial biomass.
Answer: two thirds
Question 16: The symbiotic relationship between the coral animals and the zooxanthellae is an example
of _________.
Answer: mutualism
Question 17: The organism posing the greatest threat to the kelp forest is the _________.
Answer: sea urchin
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Question 1: The three varieties of seeps on the seafloor include hypersaline, hydrocarbon and:
Answer: subduction zone seeps
Question 2: Which of the following environments supports chemosynthesis? Choose all that apply.
Answer: -subduction zones where methane from the decomposition of organic material in folded
sedimentary rocks trickles from the sea floor -mid-ocean ridges associated with black smokers -areas where
high-salinity waters percolate from the sea floor -hydrocarbon seeps that emit methane
Question 3: The amount of life on the ocean floor depends primarily on _________.
Answer: the productivity of the surface layer above it
Question 4: The water pressure at the mid-ocean ridges exceeds ________ times greater than
atmospheric pressure at sea level.
Answer: 200
Question 5: In the deep ocean, mud like clay deposits are found on the ________.
Answer: abyssal plains and deep trenches
Question 6: On the diagram of rocky-shore tide zones shown below, use the organisms present to match
each letter to the correct tide zone. Match the words in the left column to the appropriate blanks in the
sentences on the right. Make certain each sentence is complete before submitting your answer.
Answer: 1. B: Low tide zone 2. A: Middle tide zone 3. C: Spray zone 4. D: High tide zone
Question 7: On the diagram below, match the correct letter to each of the following features of a sea
anemone. Match the words in the left column to the appropriate blanks in the sentences on the right.
Make certain each sentence is complete before submitting your answer.
Answer: 1. D: Gut 2. E: Trigger 3. C: Cnidoblast 4. A: Mouth 5. B: Nematocyst
Question 8: The diagram below shows tide zones in a sediment-covered shore. Use the letters to match
the tide zones shown in the figure with the correct representative organisms. Match the words in the
left column to the appropriate blanks in the sentences on the right. Make certain each sentence is
complete before submitting your answer.
Answer: 1. C: Sand dollar 2. D: Ghost shrimp 3. B: Ghost crab 4. E: Sand star 5. A: Bristle worm
Page 1
, Question 9: The diagram below shows the structure of the giant brown bladder kelp (Macrocystis).
Match each letter with its correct structure on the kelp. Match the words in the left column to the
appropriate blanks in the sentences on the right. Make certain each sentence is complete before
submitting your answer.
Answer: 1. B: Pneumatocyst 2. C: Blade 3. D: Holdfast 4. A: Stipe
Question 10: Use the letters on the diagram below to match the coral types with the depth zones in
which they live. Match the words in the left column to the appropriate blanks in the sentences on the
right. Make certain each sentence is complete before submitting your answer.
Answer: 1. A: Delicate plate corals 2. B: Massive branching corals 3. D: Massive head corals 4. C: No coral
grows here
Question 11: Which of the following are not a species found in hydrothermal vent biocommunities?
Answer: corals
Question 12: Symbiotic archaea that live inside tubeworms can use two different methods to metabolize
________ and can switch back and forth to accommodate fast-changing environmental conditions.
Answer: carbon dioxide
Question 13: Which of the following hydrothermal vent fields builds chimneys of calcium carbonate,
instead of the metal sulfides found at typical black smokers?
Answer: lost city
Question 14: The primary producers in chemosynthetic vent communities are _________.
Answer: archaea
Question 15: Recent studies indicate that the deep biosphere, an environment that exists within the
seafloor itself, may account for up to _________ of Earth's total bacterial biomass.
Answer: two thirds
Question 16: The symbiotic relationship between the coral animals and the zooxanthellae is an example
of _________.
Answer: mutualism
Question 17: The organism posing the greatest threat to the kelp forest is the _________.
Answer: sea urchin
Page 2
