Accoding to Boyle's law, the product of pressure and volume is a constant. Hence,

Options

A. If volume of lungs is increased, then pressure decreases proportionately
B. if volume of lungs is increased, then pressure also increases proportionately
C. if volume of lungs is increased, then pressure decreases disproportionately
D. if volume of lungs is increased, then pressure remains the same.

Answer

To solve the question based on Boyle's law, we will follow these steps:

### Step 1: Understand Boyle's Law
Boyle's law states that the pressure of a gas is inversely proportional to its volume when the temperature is held constant. This means that if the volume increases, the pressure decreases, and vice versa. Mathematically, this can be expressed as:
\[ P \times V = k \]
where \( P \) is pressure, \( V \) is volume, and \( k \) is a constant.

### Step 2: Analyze the Options
We need to evaluate the options provided in the question based on the understanding of Boyle's law.

1. **Option 1**: "Volume of lungs is increased then the pressure decreases proportionately."
- This aligns with Boyle's law. If the volume of the lungs increases, the pressure inside the lungs decreases. This option is correct.

2. **Option 2**: "If volume of lungs is increased, pressure also increases proportionately."
- This contradicts Boyle's law. If the volume increases, the pressure cannot increase; hence, this option is incorrect.

3. **Option 3**: "If volume of lungs is increased, pressure decreases disproportionately."
- The term "disproportionately" is misleading here. According to Boyle's law, the pressure decreases inversely, not disproportionately. Therefore, this option is incorrect.

4. **Option 4**: "If volume of lungs is increased, pressure remains the same."
- This is also incorrect as an increase in volume would lead to a decrease in pressure, not a constant pressure.

### Step 3: Conclusion
After analyzing all the options, we conclude that the only correct statement according to Boyle's law is:
- **Correct Option**: Option 1: "Volume of lungs is increased then the pressure decreases proportionately."

### Summary of the Solution
According to Boyle's law, if the volume of the lungs increases, the pressure inside the lungs decreases proportionately. Therefore, the correct answer is Option 1.

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