Which of the following factors primarily stimulates fleas to come out of diapause?

• A. Exposure to ultraviolet light
• B. Decreased oxygen levels
• C. High concentrations of carbon dioxide
• D. Increased temperature and humidity

Answer: (D)

Verified step by step guidance

1. Understand the concept of diapause: Diapause is a state of dormancy or suspended development in insects, including fleas, which allows them to survive unfavorable environmental conditions.
2. Identify the environmental factors that can trigger the end of diapause: Fleas typically come out of diapause when conditions become favorable for survival and reproduction, such as increased temperature and humidity.
3. Analyze why increased temperature and humidity are significant: Higher temperatures and humidity create optimal conditions for flea activity, as they support the flea's life cycle and the survival of their hosts.
4. Compare the other options: Exposure to ultraviolet light, decreased oxygen levels, and high concentrations of carbon dioxide are not primary factors that stimulate fleas to come out of diapause. These factors do not directly create favorable conditions for flea survival.
5. Conclude that increased temperature and humidity are the primary stimuli for fleas to come out of diapause, as these conditions signal a suitable environment for their activity and reproduction.