Which term describes the body of a seaweed that is not differentiated into true roots, stems, or leaves?

• A. Thallus
• B. Zooplankton
• C. Rhodophyta
• D. Sea Grass

Answer: (A)

In seaweeds, the body is called a thallus, which describes a plant body that is not organized into true roots, stems, or leaves. It may have holdfasts for attachment, stipe-like stalks, and blade-like sections, but these parts aren’t true plant organs. Zooplankton refers to tiny drifting animals, Rhodophyta is the red algae group, and sea grass is a marine flowering plant with true roots and vascular tissues. So the term for the seaweed body lacking true roots, stems, or leaves is thallus.