Question

What happens when the concentration of carbon monoxide increases in plants?

• A. It will lead to decrease in respiration rate
• B. It will not have any effect on the respiration rate
• C. It will increase the rate of respiration
• D. It will first increase and then decrease the rate of respiration

Answer 1

The correct option is A It will lead to decrease in respiration rate

Cyanide, azides, dinitrophenol, carbon monoxide, rotenone, antimycin are few of the chemicals that capable of slowing down the rate of respiration. These chemicals inhibit respiratory enzymes such as cytochrome complexes. They bind to active sites and stop the functioning of enzymes. For example, carbon monoxide binds to cytochrome c oxidase and inactivates the enzyme.