[Campbell Biology P.763] Which of the following statements accurately describes the mechanis... | Practice Question
Which of the following statements accurately describes the mechanism by which a sea star's tube foot attaches to a substrate?
A: The ampulla contracts, forcing water into the podium, which then secretes de-adhesive chemicals to attach.
B: Water is absorbed by the podium, causing it to expand, and then the ampulla secretes adhesive chemicals for attachment.
C: The ampulla squeezes, forcing water into the podium, which expands and contacts the substrate, followed by secretion of adhesive chemicals from the podium's base for attachment.
D: To detach, the podium muscles contract, drawing water into the ampulla, and adhesive chemicals are secreted to release the grip.
Explanation
According to the text, 'When the ampulla squeezes, water is forced into the podium, which expands and contacts the substrate. Adhesive chemicals are then secreted from the base of the podium, attaching it to the substrate.' This accurately describes the process in option C.