Which situation is not an example of the maintenance of a dynamic equilibrium in an organism? Select one:

a. Guard cells contribute to the regulation of water content in a geranium plant. Incorrect

b. The release of insulin lowers the blood sugar level in a human after eating a big meal.

c. A runner perspires while running a race on a hot summer day.

d. Water passes into an animal cell causing it to swell.

Answer: d. Water passes into an animal cell causing it to swell.

Explanation:

Dynamic equilibrium is a constant state of the reaction when the rate of forward as well as the reverse reaction remains the same. In biology the dynamic equilibrium is used to maintain the homeostasis.

Homeostasis is the ability of the body to restrict the change in the internal environment with respect to the changes occurring in the external environment by maintaining a dynamic equilibrium between the internal and external environment of the body. The internal and external environment of the body becomes constant.

The water passes into an animal cell and swell it up is not an example of homeostasis as the internal and external conditions of the cell are not constant.

Option (D).

Explanation:

The maintenance of the equilibrium in the body is important for the physiology and proper functioning of the body. The disturbance in the equilibrium might cause disease in humans.

Each organisms has particular organs for the maintenance of the equilibrium. The guard cells gets open and close in response to the water and maintain the water equilibrium. The insulin levels maintain the blood sugar level. The perspiration provide coolness in the summers. The entry of the water cells and its non exit can cause swelling leads to some problem in animal cell.

Thus, the correct answer is option (D).