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The size of a red blood cell is $0.000007\ m$ and the size of a plant cell $0.00001275\ m$. Compare these two, which of the following is correct?A. A red blood cell is approximately $\frac{3}{4}$ of the plant cell in size.B. A red blood cell is approximately $\frac{1}{4}$ of the plant cell in size.C. A red blood cell is approximately half of the plant cell inn size.D. A red blood cell is approximately equal to the plant cell in size.
Given: The size of a red blood cell is $0.000007\ m$ and the size of a plant cell $0.00001275\ m$.
To do: To compare these two and find correct option.
Solution:
Size of red blood cell$=0.000007=7\times10^{-6}\ m$
Size of plant cell$=0.00001275\ m=1.275\times10^{-5}\ m$
Hence, a red blood cell is half a plant cell
$\therefore \frac{Size\ of\ a\ red\ blood\ cell}{Size\ of\ a\ plant\ cell}=\frac{7\times10^{-6}}{1.275\times10^{-5}} $
$=\frac{7\times10^{-1}}{1.275} $
$=\frac{0.7}{1.275}$
$≈\frac{1}{2}$
Thus, a red blood cell is half a plant cell.
Therefore, option C. is correct.
Updated on: 10-Oct-2022
3K+ Views
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