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Question

Arrange these organisms in ascending order based on their size.

1. Organism causing AIDS
2. Organism causing Typhoid
3. PPLO
4. Plant cell

A
1-2-3-4
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B
1-3-2-4
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C
4-2-3-1
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D
1-3-2-4
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Solution

The correct option is B 1-3-2-4
AIDS is caused by a virus.
Typhoid is caused by bacteria.
PPLO (Pleuropneumonia like Organisms) are the smallest known living cells. These are also called as mycoplasma.

The size of the organisms are given below:
Virus: 0.02 - 0.2 μm
PPLO: About 0.1 μm
Typical bacteria: 1-2 μm
Typical eukaryotic cell (like plant cell): 10-20 μm

Hence, the correct order is virus < PPLO < bacteria < plant cell (option b).

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