Assertion: High temperature destroys enzymatic activity .

Reason: Proteins get denatured by high temperature.

Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).

The correct answer is Option (1) – Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).

The activity of an enzyme can be affected by a change in the conditions which can alter the tertiary structure of the protein. These include temperature, pH, change in substrate concentration or binding of specific chemicals that regulate its activity.

Temperature and pH Enzymes generally function in a narrow range of temperature and pH.Each enzyme shows its highest activity at a particular temperature and pH called the optimum temperature and optimum pH. Activity declines both below and above the optimum value.

Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.