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?

Chrysophyta
Pyrrophyta
Chlorophyta
Phaeophyta

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Algae
The number of members of the division Phaeophyta that live in freshwater habitats

None of these
is lesser than the number of members of the division Chlorophyta that live in freshwater habitats
is equal to the number of members of the division Chlorophyta that live in freshwater habitats
is greater than the number of members of the division Chloro-phyta that live in freshwater habitats

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

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