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Mollusca: Quiz


Question 1: In the 1990s this species reached the ________.
North AmericaLatin AmericaCaribbeanAmericas

Question 2: [64] For example it is uncertain whether the ancestral mollusc was metameric (composed of repeating units) - if it was, that would suggest an origin from an ________-like worm.

Question 3: [2] Cephalopoda such as squid, ________ and octopus are among the most neurologically-advanced of all invertebrates.
NautilusBobtail squidCuttlefishMollusca

Question 4: Some molluscs use internal fertilization and/or are ________, functioning as both sexes; both of these methods require more complex reproductive systems.
IntersexualitySpeciesHermaphroditeSexual differentiation

Question 5: Beating ________ (tiny "hairs") drive the mucus towards the stomach, so that the mucus forms a long string.

Question 6: However, the evolutionary history both of molluscs' emergence from the ancestral Lophotrochozoa and of their diversification into the well-known living and ________ forms are still vigorously debated.
Geologic time scalePaleontologyFossilGeology

Question 7: The mantle secretes a shell that is mainly chitin and conchiolin (a protein) hardened with ________,[21][24] except that the outermost layer is all conchiolin.
Calcium carbonateCalcium silicateCalcium oxideCalcium hydroxide

Question 8: ________
(nautiloids, ammonites, squid, etc.)

Question 9: Molluscs, especially bivalves such as clams and ________, have been an important food source since at least the advent of anatomically modern humans – and this has often resulted in over-fishing.

Question 10: However, in 2004 the ________ of Threatened Species included nearly 2,000 endangered non-marine molluscs.
IUCN Red ListExtinctionEndangered speciesConservation status

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