Question
The skeletons of the members of one group of these organisms called Acantharea are unusually made of strontium sulfate rather than silica. For 10 points each:
[10h] Name this phylum of rhizarian protists that has a variety of bizarre shapes, including bells, nested spherical shells, and regular polyhedra. Haeckel’s earliest biological work was the first full taxonomy of these organisms.
ANSWER: radiolarians [or Radiolaria; or Radiozoa]
[10m] The skeletons of radiolarians and these more abundant protists make up siliceous ooze. The members of this class are centric or pennate if their frustules have radial or bilateral symmetry, and they make 20 to 50 percent of Earth’s oxygen.
ANSWER: diatoms [or Bacillariophyceae; or Diatomea; or Diatomophyceae; or Bacillariae; or Bacillariophyta; prompt on but DO NOT REVEAL phytoplankton but reject “zooplankton”]
[10e] Both radiolarians and diatoms are in this group of organisms that float in the oceans propelled by currents. Radiolarians are the “zoo” variety of these organisms, while diatoms are the “phyto” variety.
ANSWER: plankton [or microplankton; or phytoplankton; or zooplankton]
<Gerhardt Hinkle, Biology>
Summary
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