Question Detail

ZOO 101 The Excretory System Objective Question
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Question

Why do saltwater protists typically not need contractile vacuoles?
Options
A Their cell membrane is impermeable to water.
B The concentration of water is greater inside the cell than outside, so they gain water.
C The concentration of water is greater outside the cell than inside, so they constantly lose water and don't need to pump it out.
Correct Answer
D They excrete all wastes as solids.
Correct Answer

Option C is the correct answer.

Detailed Explanation

In saltwater, the environment is hypertonic, so water is drawn out of the cell, and they are in danger of dehydration, not over-hydration.

Hint

They are more likely to lose water than gain it.

Question Info

Course: ZOO 101
Topic: The Excretory System
Type: Objective
Difficulty: Not specified
Question 624 of 2214
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