National League for Nursing (NLN PAX) Practice Exam

Question: 1 / 495

When a drop of dilute nitric acid is added to water surrounding a hydra, what is the acid acting as?

A hormone

An impulse

A stimulus

In this scenario, the addition of dilute nitric acid to the water surrounding the hydra serves as a stimulus. A stimulus is any event or change in the environment that triggers a response in an organism. When the hydra is exposed to the acid, it may react due to the chemical change in its surroundings, which alters factors such as pH and can affect the hydra's physiological responses.

This response could manifest in various ways, such as changes in movement or behavior, indicating that the hydra is capable of responding to changes in its environment. Understanding this relationship between stimuli and responses is fundamental in studying biology, particularly in the context of how living organisms interact with their surroundings.

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