Which of the following best describes the algae known as diatoms?

Q. Which of the following best describes the algae known as diatoms?

  1. Cells have intricate shells of silicon dioxide with two halves
  2. Cells are encased in rigid walls composed of cellulose coated with silicon
  3. Cells have flagella and a light-detecting eye spot
  4. Cells contain carotenoid pigments as well as chlorophyll A and B

Answer: Cells have intricate shells of silicon dioxide with two halves

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