Algae
Which algal division is divided up into three main groups consisting of the golden-brown algae, the yellow-green algae and the diatoms?

Phaeophyta
Chlorophyta
Pyrrophyta
Chrysophyta

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

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

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