What is the root-like structure at the base of an algae (seaweed) that binds the algae to a hard substrate like a stone?

The correct answer is HoldfastKey Points

• The root-like structure at the base of an alga that binds it to a hard substrate like a stone is called the holdfast.
• The holdfast is similar to a plant root in that it anchors the organism in place.
• However, unlike plant roots, the holdfast's sole function is attachment and it does not extract nutrients.

Additional Information

•  Some other parts of a seaweed:
  • Stipe: The stalk of seaweed between the holdfast and blade, which resembles a stem
  • Frond: The term used to refer to the stipe and blade together 
  • Seaweeds are often found in dense growths on rocky shores or in shallow water.
  • They are commercially important to humans and are used as fertilizers or as sources of polysaccharides
  • The midrib is the central vein of a leaf that runs from the leaf base to the tip.