Question

The immediate arrest of development or activity in the life cycle of an insect is known as

• A. Diapause
• B. Aestivation
• C. Hibernation
• D. Quiescence

Hint:

Remember the key distinction:
Quiescence = Direct, immediate response to stress, resumes immediately.
Diapause = Programmed, physiological state, requires a recovery period to break.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Insects adapt to unfavorable environmental conditions through physiological states of inactivity, which can be either genetically programmed or directly induced by the environment.

Step 2: Detailed Explanation:
Let us distinguish between the different forms of dormancy in insects:
Diapause is a genetically programmed, hormonally controlled state of developmental arrest.
It is induced by environmental cues (like photoperiod) well before the onset of unfavorable conditions, and cannot be reversed immediately when favorable conditions return.
Aestivation is summer dormancy in response to dry, hot conditions.
Hibernation is winter dormancy in response to cold conditions.
Quiescence is an immediate, non-programmed arrest of development or physical activity in direct response to unfavorable environmental conditions (such as cold, drought, or lack of food).
As soon as the unfavorable factor is removed, the insect resumes its normal development and activity immediately without any physiological lag.
Thus, the "immediate arrest" of development is known as quiescence.

Step 3: Final Answer:
The immediate arrest of development or activity in response to unfavorable factors is Quiescence.