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  1. The smallest size of a cell that can be seen with naked eye is:
    1. 1 micron
    2. 10 micron
    3. 100 micron
    4. 1000 micron
Correct Option: C

The smallest objects that can be seen with unaided eye are about 0.1 mm long, which is equal to 100 micrometres. Micron (u) is an alternate name of micrometre.



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