A) Pisces B) Arthropoda C) Mollusca D) Cephalopoda
A) Two B) Three C) Four D) One
A) Arctic Ocean B) Indian Ocean C) Pacific Ocean D) Atlantic Ocean
A) Hemoglobin B) Carotene C) Chromatophores D) Melanin
A) Eight B) Ten C) Twelve D) Six
A) Through skin B) Through gills C) Through lungs D) Through a snorkel-like tube
A) Giant Pacific octopus B) Dumbo octopus C) Blue ringed octopus D) Veined octopus
A) Giant Pacific octopus B) Veined octopus C) Blue ringed octopus D) Dumbo octopus
A) Mollusca B) Arthropoda C) Cephalopodidae D) Octopoda
A) Over 1000 species B) Exactly 500 species C) Some 300 species D) About 50 species
A) Asymmetric B) Spherically symmetric C) Bilaterally symmetric D) Radially symmetric
A) Their mantle B) Their tentacles C) Their beak D) The siphon
A) They become senescent and die B) They start caring for the eggs C) They continue to live for many years D) They migrate to a different habitat
A) It can make humans invisible B) It is harmless to humans C) It is deadly to humans D) It cures diseases
A) Medusa B) Cerberus C) The kraken D) Pegasus
A) Pottery B) Calligraphy C) Woodblock prints D) Shunga erotic art
A) Toilers of the Sea B) Les Misérables C) The Hunchback of Notre-Dame D) The Man Who Laughs
A) Singing loudly B) Flying away C) Building nests D) Expelling ink
A) Octo B) Octopi C) Octopuses D) Octopodes
A) Camouflage and deceit B) Sound waves C) Fireworks D) Electric shocks
A) The siphon B) The mantle C) The beak D) A specially-adapted arm
A) They eat the eggs B) They migrate to a new habitat C) They care for the eggs until they hatch and then die D) They abandon the eggs
A) Their beak B) Their siphon C) Their tentacles D) Their eyes
A) 10–50 kg (22–110 lb) B) 30–60 kg (66–132 lb) C) 70–100 kg (154–220 lb) D) 5–20 kg (11–44 lb)
A) Funnel B) Arm C) Mantle D) Head
A) Four pairs B) Eight pairs C) Two pairs D) Six pairs
A) Suckers on the arms B) Cartilaginous capsules C) Muscles in the mantle D) Cells in the fibrous dermis
A) Chemical secretions B) Muscle contractions in the suckers C) Pressure changes in the mantle D) Nerve impulses from the brain
A) Octopus wolfi B) Giant Pacific octopus C) Cirrina D) Haliphron atlanticus
A) Changes color for camouflage B) Produces light C) Detects sound waves D) Screens incident light in bright conditions
A) Collagen B) Silica C) Bone D) Cartilage
A) Closed B) Open C) Semi-closed D) None
A) Haemocyanin B) Cytochrome c C) Myoglobin D) Hemoglobin
A) Red B) Green C) Bluish D) Yellow
A) Ibáñez et al., 2020 B) Kröger et al., 2011 C) Fuchs et al., 2019 D) Sanchez et al., 2018
A) United States B) France C) Italy D) Germany
A) Incirrates B) Cirrates C) Decapods D) Pterygota
A) Hawaiian day octopus B) Common octopus C) Vulcanoctopus hydrothermalis D) Spoon-armed octopus
A) Hydrothermal vents B) Coral reefs C) Seagrass beds D) Fresh water
A) Japetus Steenstrup B) Heinrich Müller C) Georges Cuvier D) Aristotle
A) Operant conditioning B) Social learning C) Classical conditioning D) Observational learning
A) Gram-negative bacterium Vibrio lentus B) Protozoan Vibrio lentus C) Fungus Vibrio lentus D) Gram-positive bacterium Vibrio lentus
A) Giant Pacific octopuses B) Cirrate octopuses C) Blue-ringed octopuses D) Common octopuses
A) DNA ligase enzymes B) Helicase enzymes C) ADAR enzymes D) RNA polymerase enzymes
A) Carotene B) Melanin C) Hemoglobin D) Chlorophyll
A) Dicyemidae B) Aggregata C) Vibrio D) Cirrina
A) Vulcanoctopus hydrothermalis B) Common octopus C) Argonauts D) Spoon-armed octopus
A) 65% B) Around 41% C) 33% D) 3%
A) Minoan civilization B) Ancient Egypt C) Roman Empire D) Maya Civilization
A) Reproduction B) Senescence C) Maturity D) Juvenile stage
A) Four B) Two C) One D) Three
A) Nihon Shoki B) Kojiki C) Genji Monogatari D) Taishokan
A) Flapper valves B) Circular muscles C) Radial muscles D) Branchial hearts
A) Calcium carbonate B) Protein C) Silica D) Chitin
A) Gravity's Rainbow (1973) B) Twenty Thousand Leagues Under the Sea C) Jaws D) Moby Dick
A) Urine B) Ammonia C) Blood D) Fluid
A) Ejecting ink as a defense mechanism B) Changing texture of the skin C) Conspicuous warning coloration D) Camouflage to blend into surroundings
A) Funnel B) Hectocotylus C) Tentacles D) Beak
A) Enteroctopus dofleini. B) Octopus vulgaris. C) Sepia officinalis. D) Grimpoteuthis.
A) They disappear completely B) They expand and become more visible C) They change color to blend in with surroundings D) The muscular skin folds contract, revealing the iridescent warning
A) The mantle develops B) The embryo splits into two C) The shell gland forms D) The germinal disc surrounds the yolk, forming a yolk sac
A) Emitting bioluminescent light B) Mimicking other, more dangerous animals C) Changing color to blend with sand D) Building complex shelters
A) The crop B) The buccal mass C) The caecum D) The stomach
A) Seven months B) Two months C) Five months (160 days) D) One month
A) Yes B) Only if connected to the mantle cavity C) No D) Only if connected to the brain
A) U, W, or dumbbell-shaped B) Square C) Round D) Triangular
A) Is negligible compared to resting energy use B) Nearly matches the energy used at rest C) Is higher than all other activities combined D) Is lower than the energy used at rest
A) 50% B) 66% C) 80% D) 40%
A) Bony frameworks B) Cartilage supports C) Extensive connective tissue lattices D) Muscle fibers
A) Strychnine B) Tetrodotoxin C) Cyanide D) Curare
A) Spherical B) Flat disc C) Cornucopia-shaped D) Cylindrical
A) Gregor Mendel B) Carl Linnaeus C) Charles Darwin D) William Elford Leach
A) Only during mating displays B) Yes, but only in their brains C) Yes, like many other animals D) No
A) Shallow estuarine waters B) Temperate coastal waters C) Colder waters, such as those off Alaska D) Warmer tropical waters
A) Its blood pressure drops. B) It has no gill hearts. C) It uses more oxygen. D) The systemic heart becomes inactive.
A) Four B) One C) Two D) Eight
A) Italy B) France C) United Kingdom D) Germany
A) Bluffing a threatening appearance B) Changing color to communicate C) Camouflaging into the environment D) Ejecting ink as a defense mechanism
A) Temperature changes B) Predator presence C) Lack of food D) The optic glands
A) Vulcanoctopus hydrothermalis B) Abdopus aculeatus C) Hawaiian day octopus D) Spoon-armed octopus
A) The intestine B) The crop C) The stomach D) The caecum
A) Cephalopoda B) Vibrio C) Dicyemidae D) Aggregata
A) Coral reefs B) Deep ocean trenches C) Pelagic waters D) Shallow tide pools
A) Trawling B) Hooking C) Pots D) Trapping
A) In the mantle cavity B) Attached to the optic gland C) Near the beak D) Under the digestive gland |