Symptoms of disease appear only after a certain period of mosquito bite in case of diseases spread by mosquitoes. Give reason.

Explanation

### Step-by-Step Solution:

1. **Understanding the Transmission**: When a mosquito bites an individual, it injects a parasite known as Plasmodium into the bloodstream. This is the initial step in the infection process.

2. **Travel to the Liver**: After entering the bloodstream, the Plasmodium parasite travels to the liver. This is where it begins to multiply.

3. **Multiplication in the Liver**: The Plasmodium undergoes asexual reproduction in the liver, increasing its numbers significantly. This multiplication is crucial for the subsequent stages of the disease.

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