Q. Which class of algae is used in the manufacture of dynamite?
A. Chlorophyceae
B. Chrysophyceae
C. Cryptophyceae
D. Pheophyceae
Diatomite: It is a rock-like deposit formed on the siliceous walls of diatoms (algae of Chrysophyceae). When they die they sediment so that on the seabed and lake bottom extensive deposits can be built up over long periods of time. The resulting 'diatomaceous earth' has a high proportion of silica. Diatomite is used as a fireproof material and also as an absorbent.
It is used in sound and fireproof rooms. It is also used in packing of corrosive materials and also in the manufacture of dynamite.
B. Chrysophyceae
C. Cryptophyceae
D. Pheophyceae
Answer: Chrysophyceae
Diatomite: It is a rock-like deposit formed on the siliceous walls of diatoms (algae of Chrysophyceae). When they die they sediment so that on the seabed and lake bottom extensive deposits can be built up over long periods of time. The resulting 'diatomaceous earth' has a high proportion of silica. Diatomite is used as a fireproof material and also as an absorbent.
It is used in sound and fireproof rooms. It is also used in packing of corrosive materials and also in the manufacture of dynamite.
The Chrysophyceae, usually called chrysophytes, chrysomonads, golden-brown algae or golden algae are a large group of algae, found mostly in freshwater. Golden algae is also commonly used to refer to a single species, Prymnesium parvum, which causes fish kills.
The Chrysophyceae should not be confused with the Chrysophyta, which is a more ambiguous taxon. Although "chrysophytes" is the anglicization of "Chrysophyta", it generally refers to the Chrysophyceae.
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