Which condition can hydrilla tolerate?

Hydrilla is known for its remarkable adaptability to various environmental conditions, which is why it has become a prevalent invasive aquatic weed in many water bodies. Among the options listed, high degrees of salinity is indeed a condition that hydrilla can tolerate, although it generally prefers freshwater environments. Hydrilla's ability to withstand some salinity levels allows it to thrive in habitats that might not be suitable for other aquatic plants.

While hydrilla is primarily a freshwater plant, research indicates that it can tolerate certain concentrations of salt, enabling it to survive and sometimes establish itself in areas where salinity is elevated, albeit not to the extent of being fully marine. This adaptive trait contributes to its invasive potential, as it can spread into a variety of aquatic ecosystems.

The other options, such as extremely low temperatures, complete submersion in saltwater, and low humidity, do not align with the typical ecological preferences or tolerances of hydrilla. In contrast to its adaptability to salinity, hydrilla is susceptible to cold temperatures, which can limit its growth and expansion. It thrives in warmer climates, making extremely low temperatures a challenging condition. Complete submersion in saltwater is beyond its tolerance levels, as hydrilla is not suited to full marine conditions.