Algae
Which of the following algal divisions is characterized by possession of chlorophylls A and B, starch as the energy storage material, cellulosic cell walls and live in freshwater and marine habitats?

Chlorophyta
Pyrrophyta
Chrysophyta
Phaeophyta

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

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

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