Questions

2025SP-BZ-111-L02 Quiz 2 (Labs 5-8)

Matching

Consider the movement of water through the water-vascular system in starfish. Rearrange the following statements in order with 1 representing the first step. The following photo might be of help. 1: 1 2: 2 3: 3 4: 4

Options

A.From the ring canal, radial canals run outward through each arm. Lateral canals connect these radial canals to ampulla that lie at the base of tube feet.

B.When the ampulla contracts, the fluid is prevented from entering the radial canals by a one-way valve and is forced into the tube foot, thus extending it.

C.Water enters the system through the madreporite.

D.Water then flows through the stone canal to the central ring canal.

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Step-by-Step Analysis

To solve this matching-type question, I’ll evaluate the logical sequence of steps in the water-vascular system of starfish. Option 1: 'From the ring canal, radial canals run outward through each arm. Lateral canals connect these radial canals to ampulla that lie at the base of tube feet.' This places the radial and lateral canal connections before mentioning the entry point of water into the system. Since water must first enter through the madreporite and travel to the ring canal via the stone canal, this option jumps ahead of essential initial steps and misplaces the early flow before the water has even reached th......Login to view full explanation

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