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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 are also called pearls of ocean due to:
(i) They are siliceous, thus deposit silica in ocean after their death. (ii) They are autotrophic and major producers in ocean.
(iii) Diatomaceous earth with deposits of silica is chemically inert, porous, absorbent and fireproof.
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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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