Question

Unlike other algae, diatoms do not easily decay due to

• A. siliceous wall
• B. mucilaginous wall
• C. waterproof cell wall
• D. calcareous wall

Answer 1

The correct option is A siliceous wall

The cell wall of diatoms is made up of two layers. Inner layer is made up of pectin like material and encloses protoplast. Outer layer is made up of silica and it contains two halves and is fixed together. Silica does not decompose easily so preserves the diatom for a long period of time without decay.