Question

Assertion :According to Von't Hoff's rule, metabolic activity doubles with every ${10}^{o}C$ increase in temperature.
Reason: The reaction rate is not affected with every ${10}^{o}C$ decrease in temperature.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

Van't Hoff's rule stated that rate of the metabolic reaction increases with rise of temperature. At every 10${}^o$C rise in the temperature, the rate of metabolic reaction doubles. The relationship between temperature and metabolic rate is often measured as Q${}_{10}$.

At high temperature enzymes gets activated. The increased temperature increases the kinetic energy of the enzymes which further accelerates the activity of the enzyme but at higher temperature it gets denatured as the peptide bonds between the proteins molecules breaks which disrupts the structure of enzymes.

So, the correct answer is option A.