Which of the following plants is susceptible to drawdown?

The correct choice is waterlily, as this plant is particularly susceptible to drawdown, which refers to a significant reduction in water level. Waterlilies thrive in consistent water conditions, and when the water level drops, their roots can be exposed to air, disrupting their growth and ultimately leading to their decline. This sensitivity to changing water levels makes them vulnerable during periods of drawdown.

In contrast, coontail, cattail, and sago pondweed are adapted to varying water levels and are generally more resilient to changes in their aquatic environments, which explains their lower susceptibility to drawdown compared to waterlilies. Understanding these differences is crucial for effective aquatic pest management and maintaining healthy aquatic ecosystems.