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1(current)

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 |

85%

Level 1: 80%+

AIPMT - 1999

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Q2:

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 |

Level 3: 35%-60%

AIPMT - 2005

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1(current)

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