The amount of peroxidase will be changed by using different types of turnip extracts prepared for us adding different amounts of water to the mixture adding more or less buffer to the test tube changing the amount of turnip extract used

Changing the amount of turnip extract used

Explanation:

Peroxidase is an enzyme which is used by the cell to detoxify the cell and prevention from Reactive oxygen species.

The hydrogen peroxide (H₂O₂) is produced as a product of some reaction and in the presence of peroxidase is converted into the Oxygen and Hydrogen gas.

The peroxidase enzyme can be extracted from various organisms like fungi, animals and plants but in the given question since the turnips are used as a source of enzyme, therefore, changing the amount of turnip extract can change the amount of peroxidase enzyme.

Thus, the selected option is correct.