Answer:
Diatoms and desmids are
inducted under chrysophytes, kingdom-Protista. These are the main producers in
the ocean. They prepare food not only for themselves but also for the other
life forms in the ocean. This is the reason they are also called as 'pearls of
ocean .Body of diatoms is covered by siliceous shell known as frustule.
'Diatomaceous earth'
is the accumulation of large deposits of diatoms that forms a siliceous
covering extending for several 100 m formed in billions of years. The material obtained
from these deposits is used in polishing and filtration of oils and syrups.
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