What allows diatoms to expand in size during reproduction?
a. Frustule
b. Flagellate
c. Pennate
d. Auxospore
ANS: D
An auxospore is a naked diatom cell without valves. In favorable growth conditions, the auxospore
expands to the diatom's original size. It can become dormant when conditions are unfavorable for
growth. Information can be found in the section Most Phytoplankton are Photosynthetic Autotrophs
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