Question

The tube feet in echinoids emerge through

• A. interambulacral plates
• B. ambulacral plates
• C. bourelets
• D. plastron

Hint:

In echinoids, tube feet are essential for locomotion and feeding and emerge from ambulacral plates, which radiate from the center of the organism.

Answer 1

The Correct Option is B

Step 1: Understanding the question.
The question asks about the location through which tube feet in echinoids emerge. Tube feet are an important feature for movement and feeding in echinoids (sea urchins).
Step 2: Analyzing the options.
(A) interambulacral plates: Incorrect — The tube feet in echinoids do not emerge from interambulacral plates.
(B) ambulacral plates: Correct — Tube feet emerge from the ambulacral plates, which are part of the structure that allows sea urchins to move and feed.
(C) bourelets: Incorrect — Bourelets are not involved in the emergence of tube feet in echinoids.
(D) plastron: Incorrect — The plastron is a different part of the echinoid body, not associated with tube feet.
Step 3: Conclusion.
The correct answer is (B) ambulacral plates, as tube feet in echinoids emerge through these plates.