Question Detail

ZOO 101 ZOO 101 Past Questions Objective Question
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Question

Why do saltwater protists lack contractile vacuoles?
Options
A They do not produce metabolic wastes.
B The concentration of water is higher inside the cell than outside.
Correct Answer
C They use Malpighian tubules instead.
D They excrete wastes through nephridia.
Correct Answer

Option B is the correct answer.

Detailed Explanation

Saltwater protists lack contractile vacuoles because the concentration of water is higher inside the cell than outside. Water tends to leave the cell by osmosis, 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 1950 of 2214
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