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Diatoms are also called as 'pearls of oc...

Diatoms are also called as 'pearls of ocean' why ? What is diatomaceous earth ?

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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 filteration of oils and syrups.
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Knowledge Check

  • Diatomaceous earth is used in

    A
    Purification of uranium
    B
    Filtration and purification of lipids
    C
    Insulatoin and sound proofing
    D
    Both b and c

  • Diatomaceous earth is used for

    A
    Polishing
    B
    Filtration of oils
    C
    Filtration of syrups
    D
    All of the above

  • How many statements are correct with respect to chrysophytes ? (i) They are found in the marine environment , freshwater organisms are very rare. (ii) In diatoms , the cell wall form two thick overlapping shells which fit together as in a soapbox . (iii) The cell membranes of diatoms are embedded with silica and accumulation of them over billions of years is referred to as "diatomaceous earth " (iv) Diatoms are the chief " Producers" In the oceans .

    A
    1
    B
    2
    C
    3
    D
    4

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