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Q 1: What percentage of the Earth's oceans is considered the deep sea?
A) 50%
B) 80%
C) 90%
D) 10%
Explanation: More than 70% of our planet is ocean – and 90% of that ocean is deep sea - University of Plymouth.
Q 2: At what depth does the deep sea typically begin?
A) 200 meters (656 feet)
B) 1,000 meters (3,280 feet)
C) 4,000 meters (13,123 feet)
D) 10,000 meters (32,808 feet)
Explanation: The deep ocean is generally defined as the depth at which light begins to dwindle, typically around 200 meters (656 feet). Remotely operated vehicle Deep Discoverer explores the Mariana Trench at the depth of 6,000 meters (3.7 miles).
Q 3: Which of the following is NOT a characteristic of deep-sea environments?
A) High pressure
B) Complete darkness
C) High temperatures
D) Low nutrient availability
Explanation: High temperatures
Q 4: What is the name of the deepest known part of the ocean in the Mariana Trench?
A) Challenger Deep
B) Marianas Trench Deep
C) Abyssal Pit
D) Challenger Trench
Explanation: The average depth of the ocean is about 3,682 meters (12,080 feet). The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam.
Q 5: Which of these is a common adaptation of deep-sea creatures?
A) Large eyes for seeing in the dark
B) Small size to conserve energy
C)
C)
D) All of the above
Explanation: All of the above
Q 6: What is the primary source of food for organisms in the deep sea?
A) Plankton
B) Sunlight
C) Dead fish
D) Hydrothermal vents
Explanation: Plankton
Q 7: Which of these is NOT a deep-sea habitat?
A) Abyssal plain
B) Hydrothermal vent
C) Coral reef
D) Deep-sea trench
Explanation: Coral reef
Q 8: How do deep-sea organisms survive in extreme pressure environments?
A) They have thick, strong skin
B) They have no air spaces in their bodies
C) They have specialized organs to regulate pressure
D) They do not survive in extreme pressure
Explanation: They have no air spaces in their bodies
Q 9: What is the name of the process by which deep-sea creatures create light?
A) Bioluminescence
B) Photosynthesis
C) Chemiluminescence
D) Luminescent respiration
Explanation: Bioluminescence is light produced by living organisms. It is extremely common in the oceans and occurs in all oceans at all depths. Many deep-sea creatures are bioluminescent. The light is produced by symbiotic bacteria within light-emitting cells called photophores.
Q 10: Which of these is a common deep-sea creature?
A) Anglerfish
B) Seahorse
C) Clownfish
D) Jellyfish
Explanation: Anglerfish
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