Which of the following organisms are known as chief producers in the oceans?
1. Dinoflagellates
2. Diatoms
3. Cyanobacteria
4. Euglenoids
Subtopic:  Kingdom Protista: Chrysophytes |
 91%
From NCERT
NEET - 2018
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Select the wrong statement:

1. The walls of diatoms are easily destructible
2. Diatomaceous earth is formed by the cell walls of diatoms
3. Diatoms are chief producers in the oceans
4. Diatoms are microscopic and float passively in water
Subtopic:  Kingdom Protista: Chrysophytes |
 92%
From NCERT
NEET - 2016
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In which group of organisms the Cell walls form two thin overlapping shells which fit together?

1. Chrysophytes 2. Euglenoids
3. Dinoflagellates 4. Slime moulds
Subtopic:  Kingdom Protista: Chrysophytes |
 81%
From NCERT
NEET - 2015
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Auxospores and hormocysts are formed respectively, by:

1. Some cyanobacteria and many diatoms

2. Several diatoms and a few cyanobacteria

3. Several cyanobacteria and several diatoms

4. Some diatoms and several cyanobacteria 

Subtopic:  Kingdom Protista: Chrysophytes |
From NCERT
AIPMT - 2005
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Diatomaceous earth is used as a heat insulator in boilers and steam pipes because the cell wall of diatom is
1.  Composed of iron
2.  Composed of silicon dioxide
3.  a good conductor of heat
4.  a bad conductor of electricity

Subtopic:  Kingdom Protista: Chrysophytes |
 84%
From NCERT
AIPMT - 1999
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