Sea Animal Quiz
Questions: 16 · 10 minutes
1. What are the tiny coral polyps that build coral reefs?
Mineral crystals produced by seawater
Plants related to sea grasses
Fungi that grow on submerged rocks
Animals related to jellyfish and sea anemones
2. What material makes up most of a shark's skeleton?
Cartilage
Calcium-rich bone
Keratin
Chitin
3. A salmon moves from freshwater into the ocean. Which body process must adjust to help it manage the new salt concentration?
Osmoregulation
Metamorphosis
Echolocation
Bioluminescence
4. A toothed whale produces clicks in dark water and interprets the returning echoes. What ability is it using?
Echolocation
Electroreception
Chemical camouflage
Bioluminescence
5. In a kelp forest, sea otters eat sea urchins, and sea urchins graze on kelp. If the otter population falls sharply, what is the most likely immediate change?
Sea urchins disappear because kelp becomes scarce
Kelp grows faster because more urchins graze it
Sea urchin numbers rise because fewer are eaten
Sea otters switch from breathing air to using gills
6. A researcher sees an animal repeatedly rise to the surface, exhale through a blowhole, and dive again. Which animal best fits these observations?
A great white shark
A bottlenose dolphin
A giant manta ray
A bluefin tuna
7. How many hearts does an octopus have?
One
Two
Four
Three
8. A whale shark swims with its broad mouth open, straining tiny organisms from the water. Which feeding method is this?
Grazing
Scavenging
Filter feeding
Venomous ambush
9. During prolonged heat stress, a reef-building coral turns unusually pale. What most directly causes this bleaching?
The coral uses up all calcium carbonate in the surrounding ocean
The coral replaces its outer tissue with white scales
The coral loses many of the symbiotic algae living in its tissues
The coral stops reflecting sunlight because its polyps close
10. In the deep sea, an anglerfish uses a glowing lure near its mouth. What is a likely function of this adaptation?
Producing oxygen for its gills
Attracting prey within striking distance
Heating the surrounding water
Removing salt from its body
11. When threatened, a cuttlefish rapidly changes its skin pattern to resemble the seabed. Which feature mainly makes this possible?
Rows of dermal teeth
Pigment-containing skin cells called chromatophores
A shell that absorbs surrounding colors
A layer of insulating blubber
12. A sea star grips a rock and moves slowly across it. Which structures are chiefly responsible for this movement and attachment?
Jointed walking legs
A muscular foot like a snail's
Paired fins supported by cartilage
Tube feet operated by a water vascular system
13. A mussel is exposed to sun and air when the tide goes out. Which behavior most directly helps it avoid drying out?
Closing its shell tightly to retain moisture
Extending its feeding structures into the air
Releasing its grip and rolling toward shore
Shedding its shell until the tide returns
14. A fish keeps water moving through its mouth and over a specialized structure. Which structure extracts dissolved oxygen from that water?
Swim bladder
Lateral line
Pectoral fins
Gills
15. A sea turtle pauses at the ocean surface before diving again. What essential need is it meeting?
Filtering plankton through its mouth
Absorbing oxygen through its shell
Breathing air into its lungs
Removing salt through its flippers
16. Which statement correctly describes reproduction in seahorses?
Both parents attach eggs to rocks and leave them
The male carries developing embryos in a brood pouch
The female carries embryos inside a brood pouch
Young seahorses develop inside external jelly-like egg masses