Which of the following structures in honeybees helps detect light?

The ocelli are specialized simple eyes found on the heads of honeybees that play a crucial role in detecting light. Each honeybee has three ocelli located atop its head, which are designed specifically to sense changes in light intensity rather than forming detailed images. This ability to detect fluctuations in light is vital for navigation, especially during flight, as it helps bees orient themselves with respect to the sun and their surroundings.

In contrast, the proventriculus is part of the digestive system, linked to processing food, while sclerites refer to the hardened plates that form parts of the exoskeleton. Tergites are components of the abdominal segments of bees and have a structural rather than sensory function. Thus, ocelli are unique in their specific function of light detection among the other structures listed, making them the correct choice in this context.