One adaptation shown by hydrophytes in freshwater habitats is the

Explanation

Hydrophytes (aquatic plants) in freshwater habitats often have adaptations that allow them to thrive in environments with abundant water. Consequently, one of the adaptations shown by hydrophytes in freshwater is poor development of roots and xylem tissues. Two common adaptations are:

1. Poor development of roots: Since water is readily available, hydrophytes don't need extensive root systems to absorb water and nutrients.

2. Poor development of xylem tissues: Xylem tissues are responsible for transporting water and minerals from the roots to the rest of the plant. With abundant water surrounding the plant, the need for xylem tissues is reduced.

The other options are not accurate:

A. Leaves reduced to spines: This adaptation is more common in xerophytes (plants adapted to dry environments), not hydrophytes.

C. Waxy developed roots and supporting system: This adaptation is more common in plants that need to conserve water, not hydrophytes.