Diatomaceous earth is used for making __________?
A. Fertilizers
B. Weedicides
C. Insecticides
D. Fire proof bricks
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Diatoms stay afloat due to___________?
A. Flagella
B. Stored lpids
C. Pseudopodia
D. All of these
The chloroplasts of diatoms and chrysophycean algae do not possess____________?
A. Chloryphyllpigments
B. Enzymes for photolysis
C. Defined grana and stroma
D. Carotenes with chlorophylls
Oil body is found in the cells of___________?
A. Diatoms
B. Slime moulds
C. Chlorophycean forms
D. None of the these
Diatom frustule/ shell is made of_____________?
A. Silica
B. Calcium carbonate
C. Manesium carbonate
D. Both B. and C.
Empty diatom cells are called___________?
A. Raphe
B. Valves
C. Frustule
D. Girdles
Cell wall is extremely well preserved in fossil specimens in__________?
A. Diatoms
B. Dinoflagellates
C. Slime moulds
D. None of these
Unlike other algae, diatoms do not readily decay due to___________?
A. Nonliving cells
B. Siliceous wall
C. Mucilaginous wall
D. Water proof cell
The cell wall is usually composed of two overlapping halves called epitheca and hypotheca in__________?
A. Diatoms
B. Desmids
C. Pyrrophyta
D. Chlorophyta
Cell wall is richly impregnated with silica in__________?
A. Rhodophyta
B. Phaeophyta
C. Baciliariophyta
D. Euglenophyta