Cat tail is the common name for:

Correct option is A

Correct Answer: (a) Typha
Explanation:
→ Typha (cattail) is commonly called cat tail — emergent macrophytes with characteristic cylindrical brown inflorescences found in marshes and pond margins.
Information Booster:
→ Typha stands provide habitat, stabilize banks, and are used in constructed wetlands for nutrient removal.
Additional Information (Other Options):
(b) Trapa — water chestnut (floating/ rooted), (c) Vallisneria — submerged, (d) Pistia — free-floating.