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a
The walls of diatoms are not easily destructible.
b
Diatoms have two flagella arranged perpendicular to each other.
c
Diatomaceous earth is gritty and used in polishing, filtration of oils and syrups.
d
Diatoms are found in both fresh water and marine environments.
answer is B.
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Detailed Solution
Diatoms cells do not have flagella. Organisms with two flagella arranged perpendicularly are dinoflagellates. The cell walls of diatoms are not easily destructible because they are embedded with silica. Diatomaceous earth is gritty and hence used in polishing and filtration of oils and syrups. They are found in both fresh water and marine environments.