What is the root-like structure at the base of an algae (seaweed) that binds the algae to a hard substrate like a stone?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. Holdfast.
The root-like structure at the base of an algae (seaweed) that anchors it to a hard surface, such as rocks or stones, is called a holdfast. Unlike true roots of higher plants, a holdfast does not absorb nutrients or water. Its primary function is to provide attachment and stability in aquatic environments, especially in areas with strong currents or waves. Holdfasts vary in shape depending on the species and the nature of the substrate. They allow seaweed to remain in place while still being flexible enough to move with water currents, helping the algae avoid breakage and maximize sunlight exposure.