The body of a seaweed is called a

• A. Sea Grass
• B. Unicellular Algae
• C. Rhodophyta
• D. Thallus

Answer: (D)

The main idea is that seaweeds, or macroalgae, have a simple vegetative body called a thallus. This thallus is the body that carries the photosynthetic tissues and attaches to surfaces, but it isn’t organized into roots, stems, and leaves like those of land plants. It can be simple or branched and may include structures such as a holdfast for attachment, a stipe or stalk, and blade-like sections, all part of the thallus.

Sea grass is a flowering marine plant with true roots, stems, and leaves, so it’s not described by the term thallus. Unicellular algae are single cells, not a multicellular body described as a thallus. Rhodophyta refers to red algae, a group classification, not the term for the body itself. Therefore, the body of a seaweed is called a thallus.