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The cell wall of diatoms is impregnated with:
Calcium carbonate
Silica
Cellulose
Chitin
Which of the following statements is right?
Fronds are found in bryophytes
Multiciliate sperms are found in angiosperms
Diatoms produce basidiospores
Heterocysts are found in Nostoc
Diatoms belong to which class?
Phaeophyceae
Bacillariophyceae
Chlorophyceae
Xanthophyceae