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Q. No.Diatomaceous earth is a result of accumulation of cell wall deposits of diatoms over
(1) Billions of years
(2) Millions of years
(3) Thousands of years
(4) Hundreds of years
(1) Billions of years
(2) Millions of years
(3) Thousands of years
(4) Hundreds of years
Difficulty Level:
Which of the following feature is not associated with diatoms?
(1) Chief producers of Earth
(2) Form diatomaceous earth which has gritty soil
(3) Gritty soil is used in filtration
(4) Gritty soil is used in polishing
Difficulty Level:
Red tides in the sea are because of
(1) Red dinoflagellates
(2) Geladium
(3) Red Chrysophytes
(4) Red algae
Difficulty Level:
Dinoflagellates- do not possess which feature?
(1) Marine and photosynthetic
(2) Variety in colors
(3) Cell wall with silica
(4) Two flagella
Difficulty Level:
Dinoflagellates can not appear
(1) Black
(2) White
(3) More than one option is correct
(4) Pink
Difficulty Level:
Which of the following property belongs to Dinoflagellates?
(1) Loose cellulose plates in cell wall
(2) The outer surface has more loosening of cell wall than inner
(3) Rapid multiplication
(4) Not harmful for others
Difficulty Level:
Which of the following is not associated with red tides
(1) Harmful for marine organisms
(2) Gonyaulax
(3) Aquatic habitat
(4) Color is due to pigment in the cell of Dinoflagellates
Difficulty Level:
…….of them have …..flagella …..lie in a furrow between wall plates
(1) All, 2, both
(2) Many, 3, trasverse falgella
(3) Most, 2, both
(4) All, 3, longitudinal flagella
Difficulty Level:
Pellicle is found in
(1) Euglenoids
(2) Dinoflagellates
(3) Diatoms
(4) Eubacteria
Difficulty Level:
Euglenoids are not
(1) Mostly marine
(2) Have pellicle
(3) Lack cell wall
(4) Flexible body
Difficulty Level:
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