Characteristic spores of diatoms are

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(C) Auxospores are specialized cells or spores found in diatoms that play a crucial role in their life cycle.As diatoms reproduce asexually by binary

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Auxospores

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(C) Auxospores are specialized cells or spores found in diatoms that play a crucial role in their life cycle.As diatoms reproduce asexually by binary fission,their size gradually decreases because the silica cell wall (frustule) is rigid.To restore the original size,diatoms undergo sexual reproduction or specific vegetative processes to form $Auxospores$.Therefore,$Auxospores$ are considered the characteristic spores of diatoms,often formed from a zygote,which allow the organism to regain its normal size.

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