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Q.

Select the wrong statement.

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a

The walls of diatoms are easily destructible.

b

Diatoms are microscopic and float passively in water.

c

'Diatomaceous earth' is formed by the cell walls of diatoms.

d

Diatoms are chief producers in the oceans.

answer is A.

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Detailed Solution

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The walls of diatoms are not easily destructible as they are made of silica.
(2) Cell wall deposits of diatoms over ocean fl oor are called diatomaceous earth or Kieselguhr.
(3) Diatoms are the main producers of oceans and seas.
(4) Diatoms are microscopic and passive planktonic forms.

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Select the wrong statement.