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Tardigrade: Quiz


Question 1: Recent ________ and RNA sequencing data indicate that tardigrades are the sister group to the arthropods and Onychophora.

Question 2: The minute sizes of tardigrades and their membranous integuments make their ________ both difficult to detect and highly unlikely.
PaleontologyGeologic time scaleGeologyFossil

Question 3: They are microscopic, water-dwelling, segmented ________ with eight legs.

Question 4: The ________-concept resolves the problem of the nematode-like pharynx as well as some data from 18S-rRNA and HOX (homeobox) gene data, which indicate a relation to roundworms.

Question 5: The name water bear comes from the way they walk, reminiscent of a ________'s gait.
CaniformiaBearGray WolfBrown Bear

Question 6: Tardigrades often can be found by soaking a piece of ________ in spring water.

Question 7: [17] The only explanation thus far for this ability is that their lowered water state provides fewer reactants for the ________.
Radiation therapyX-rayNuclear fissionIonizing radiation

Question 8: Other environments are dunes, ________, soil, and marine or freshwater sediments, where they may occur quite frequently (up to 25,000 animals per litre).
CoastBeachCliffCoral reef

Question 9: ________ — tardigrades can withstand median lethal doses of 5000 Gy (gamma-rays) and 6200 Gy (heavy ions) in hydrated animals (5 to 10 Gy could be fatal to a human).
RadiationIonizing radiationRadioactive decayGamma ray

Question 10: Aysheaia from the middle Cambrian ________ has been proposed as a sister-taxon to an arthropod-tardigrade clade.
Burgess ShaleBurgess Shale type faunaStephen FormationAnomalocaridid

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