Question Detail

ZOO 101 ZOO 101 Past Questions Objective Question
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Question

Madreporite, the circular, flat, calcareous plate in Asterias sp. is situated near
Options
A the anus on the aboral surface
Correct Answer
B the mouth on the oral surface
C the side of the arms on the oral surface
D the junction of the arms on the aboral surface
Correct Answer

Option A is the correct answer.

Detailed Explanation

In Asterias (starfish), the madreporite is a small, circular, calcareous plate located on the aboral (upper) surface, typically near the junction of two arms and offset from the anus. It serves as the intake valve for the water vascular system, allowing water to enter and be filtered.

Hint

This structure is the entry point for water into the water vascular system and is located on the top surface of the starfish.

Question Info

Course: ZOO 101
Topic: ZOO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 829 of 2214
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