Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings
i. Mycoplasma, ii. Ostrich eggs
iii. Human RBC, iv. Bacteria

Solution: Represents the correct ascending order of cell's size.
Cells in organism vary greatly in trieir size, shapes and activities.
I. Mycoplasmas are the smallest cell with size only 0.3 mm .
II. Bacterial cell are of size 30-5 µm.
III. In hurnan red blood cells are of about 7.0 µmin diameter.
IV. Ostrich eggs are among the largest cells with size $\left(15\times 13\right)$cm.
Mycoplasma Lihe Organisms (MLOs) or mycoplasma are the smallest cell followed by the size of bacterial cell, then RBCs and ostrich egg cell is the largest known cell.