Question Detail

ZOO 101 ZOO 101 Past Questions Objective Question
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Question

Why do salt water protists NOT need contractile vacuoles?
Options
A They excrete urea instead of ammonia
B The concentration of water is greater inside the cell than outside, so water does not enter by osmosis
Correct Answer
C Their cell membranes are impermeable to water
D Salt water provides them with enough water
Correct Answer

Option B is the correct answer.

Detailed Explanation

Salt water protists do not need contractile vacuoles because the concentration of water is greater inside the cell than outside. Water tends to leave the cell by osmosis, rather than entering, so there is no excess water to remove.

Hint

In hypertonic marine environments, water leaves the cell rather than entering.

Question Info

Course: ZOO 101
Topic: ZOO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1175 of 2214
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