Cathedral termites (*Nasutitermes triodiae*) build massive mounds in northern Australia that can reach heights of up to eight meters. These structures are designed to maintain a stable internal environment despite external temperature fluctuations. To regulate internal carbon dioxide levels, the termites construct a complex network of flutes and ventilation shafts on the northern, sun-facing side of the mound. Research by biologist Dr. Fiona Vance demonstrates that these shafts rely on solar heating of the mound's outer walls to drive convective air currents, which continuously flush out stale air. Conversely, the subterranean nesting chambers remain sealed off from this ventilation loop to preserve the high humidity levels required for the survival of the termite larvae.
Based on the text, what is true of the ventilation shafts in the mounds of *Nasutitermes triodiae*?
- They are built on the sun-facing side of the mound to exploit solar heating for air circulation.Cevap
- BThey extend into the subterranean nesting chambers to lower humidity levels for the larvae.
- CThey are actively opened and closed by the termites in response to daily temperature changes.
- DThey are the primary structures used by the termites to protect the mound from northern wind currents.