What is the approximate diameter of pollen grains in nanometers ?

Options

A. 0.00025 - 0.0005
B. 2500 - 5000
C. 25 - 50
D. 25000 - 50000

Answer

To determine the approximate diameter of pollen grains in nanometers, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Size of Pollen Grains**:
Pollen grains are microscopic structures that are typically measured in micrometers (µm). The approximate size range of pollen grains is given as 250 to 500 micrometers.

2. **Convert Micrometers to Nanometers**:
We know that:
- 1 micrometer (µm) = 1,000 nanometers (nm).
Therefore, to convert micrometers to nanometers, we multiply the size in micrometers by 1,000.

3. **Calculate the Size in Nanometers**:
- For the lower limit:
\[ 250 \, \text{µm} \times 1000 = 250,000 \, \text{nm} \]
- For the upper limit:
\[ 500 \, \text{µm} \times 1000 = 500,000 \, \text{nm} \]

4. **Conclusion**:
The approximate diameter of pollen grains ranges from 250,000 to 500,000 nanometers.

### Final Answer:
The approximate diameter of pollen grains is between **250,000 nm to 500,000 nm**.

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