What is a frustule?
a. The rigid cell wall of a coccolithophore
b. The rigid cell wall of a diatom
c. A microscopic phage that attacks diatoms
d. A small appendage on a dinoflagellate
e. The photosynthetic center of cyanobacteria
Question 2Which plankton group are the most productive photosynthetic organisms (apart from cyanobacteria)?
a. dinoflagellates
b. coccolithophores
c. diatoms
d. ciliates
e. zooplankton