If the size of bacteria is 1 micron, what will be the number of it in 1 m length?

Options

A. One hundred
B. One crore
C. One thousand
D. One million

Explanation

To solve the problem of how many bacteria of size 1 micron can fit in a 1-meter length, we can follow these steps:

### Step 1: Understand the size of bacteria
The size of bacteria is given as 1 micron. We need to convert this size into meters for consistency with the length we are measuring.

1 micron (µm) = \( 1 \times 10^{-6} \) meters.

### Step 2: Calculate the number of bacteria in 1 meter
Now, we need to find out how many 1-micron bacteria can fit into 1 meter.

1 meter = \( 1 \times 10^{0} \) meters.

To find the number of bacteria that fit in 1 meter, we can use the formula:

\[ \text{Number of bacteria} = \frac{\text{Length in meters}}{\text{Size of one bacterium in meters}} \]

Substituting the values:

\[ \text{Number of bacteria} = \frac{1 \, \text{meter}}{1 \times 10^{-6} \, \text{meters}} = 1 \times 10^{6} \]

### Step 3: Convert the result into a more understandable format
The result \( 1 \times 10^{6} \) is equivalent to 1 million.

### Conclusion
Therefore, the number of bacteria in 1 meter length is 1 million.

### Final Answer
The correct option is D: 1 million.

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