Option 1 states that both the assertion and the reason are true, and the reason is the correct explanation of the assertion. Let`s evaluate each statement:

Assertion (A): In a pressure cooker, food is cooked above boiling point.

Reason (R): Boiling point of water increases as the pressure increases.

Both statements are individually true. In a pressure cooker, the pressure is increased above atmospheric pressure, which raises the boiling point of water. This allows food to cook at a higher temperature than it would in a regular pot. So, the assertion is true.

The reason also aligns with scientific principles. When pressure is increased, it compresses the gas phase of water molecules, making it more challenging for them to transition into the vapor phase. As a result, the boiling point increases. Therefore, the reason is also true.

Furthermore, the reason correctly explains why food is cooked above boiling point in a pressure cooker: the increased pressure raises the boiling point of water, allowing for higher cooking temperatures.

Therefore, both the assertion and the reason are true, and the reason is the correct explanation of the assertion. Thus, option 1 is the correct answer.