Plants that are generally rooted at the bottom and are completely underwater, except for seed heads or flowers.

Submerged plant.

Explanation:

An aquatic plant can be defined as any specie of plant that typically grows, lives or reproduces in bodies of water such as river, ocean, and sea. There are three (3) main types of aquatic plant and these includes;

I. Floating plant.

II. Emergent plant.

III. Submerged plant.

Submerged plant refer to plants that are generally rooted at the bottom and are completely underwater, except for seed heads or flowers. Some examples of submerged plants are eelgrass, coontail, hydrilla, pondweed, elodea, etc.