Question

1. which phenomenon refers to animals’ responses to the length of day or night?

a. hibernation
b. photoperiodism
c. symbiosis
d. migration

Explanation:

• Option a: Hibernation is a state of inactivity in animals during winter, not related to day/night length.
• Option b: Photoperiodism is the response of organisms to the duration of light (day/night), matching the question.
• Option c: Symbiosis is a relationship between different species, not about day/night length.
• Option d: Migration is movement of animals, often seasonal but not defined by day/night length response.

Answer:

b. Photoperiodism