Question

Insects which are active in the day time are called

• A. Nocturnal
• B. Diurnal
• C. Crepuscular
• D. Biannual

Hint:

- Day-active = Diurnal (e.g., Butterflies)
- Night-active = Nocturnal (e.g., Moths)
- Twilight-active = Crepuscular (e.g., Mosquitoes)

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Insects exhibit distinct behavioral patterns and biological rhythms, including specific periods of activity throughout a 24-hour cycle.
These activity patterns are classified based on the time of day the organisms are active.
Detailed Explanation:
Let us define the behavioral terms:
- Nocturnal: Organisms that are active primarily during the night and rest during the day (such as most moths and certain beetles).
- Diurnal: Organisms that are active primarily during daylight hours and rest at night (such as butterflies, honey bees, and dragonflies).
- Crepuscular: Organisms that are active primarily during twilight hours, specifically at dawn and dusk (such as certain mosquitoes and sphinx moths).
- Biannual: A term describing biological events that occur twice a year, which does not relate to daily behavioral activity cycles.
Therefore, insects active during the day are referred to as diurnal.

Step 2: Final Answer:
Insects active during the daytime are called diurnal.