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 1: Understand the size of pollen grains in millimeters
Pollen grains typically have a diameter ranging from approximately 25 micrometers (µm) to 50 micrometers (µm).

### Step 2: Convert micrometers to nanometers
To convert micrometers to nanometers, we use the conversion factor:
1 micrometer (µm) = 1,000 nanometers (nm).

### Step 3: Perform the conversion
- For the lower limit:
- 25 µm = 25 × 1,000 nm = 25,000 nm
- For the upper limit:
- 50 µm = 50 × 1,000 nm = 50,000 nm

### Step 4: State the range of pollen grain diameters in nanometers
Thus, the approximate diameter of pollen grains is between 25,000 nm and 50,000 nm.

### Final Answer
The approximate diameter of pollen grains is **25,000 to 50,000 nanometers**.

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