Single Choice

Siliceous frustules of diatoms being indestructible, piled up at the bottom of ocean and formed a thick bed over billions of years. Such a thick bed is known as

Ared sea
Bdiatomaceous earth
Correct Answer
Cpseudorocks
Dred tides

Solution

In diatoms, the cell walls form two thin overlapping shells, which fit together as in a soapbox. The walls are embedded with silica and thus the walls are indestructible. Thus, diatoms have left behind large amount of cell deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'.
So the correct option is "diatomaceous earth".

SIMILAR QUESTIONS

Biological Classification

Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the kingdom

Biological Classification

Select the wrong statement.

Biological Classification

What are the characteristic features of Euglenoids?

Biological Classification

Which of the following kingdoms has no well defined boundaries?

Biological Classification

Which of the following groups of organisms are included under chrysophytes?

Biological Classification

The cell wall is composed of two thin overlapping shells which fit together like a soap case in

Biological Classification

Read the following statements regarding euglenoids and select the incorrect ones. (i) These are mostly freshwater organisms found in stagnant water. (ii) Their body is covered by a protein rich layer called pellicle which makes their body flexible. (iii) They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight. (iv) They usually possess two flagella, one long and one short. (v) Euglenoids are multicellular ciliate protists.

Biological Classification

The given statements describe a group of organisms. (i) Instead of a cell wall they have a protein rich pellicle making their body flexible. (ii) They have 2 flagella, a short and a long one. (iii) They show mixotrophic nutrition. (iv) They are connecting link between plants and animals. Which of the following groups is referred to here?

Contact Details