21. The kelps are algae found in
A. Chlorophyta
B. Chrysophyta
C. Phaeophyta
D. Pyrrophyta
22. Frustules made of silica are characteristic of
A. euglenoids
B. diatoms
C. desmids
D. seaweeds
23. Algae are found in all of the following places except
A. oceans
B. soils
C. lakes and streams
D. associates with fungi
24. Which of the following best describes the algae known as diatoms?
A. Cells have intricate shells of silicon dioxide with two halves
B. Cells are encased in rigid walls composed of cellulose coated with silicon
C. Cells have flagella and a light-detecting eyespot
D. Cells contain carotenoid pigments as well as chlorophyll A and B
25. Chrysolaminarin is an energy storage material characteristic of
A. chlorophyta
B. chrysophyta
C. phaeophyta
D. rhodophyta