Question

How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?
with more contractions
with fewer contractions
the contractions would suddenly cease
with the same frequency of contractions

Answer 1

Explanation:

The contractile vacuole is basically a water bubble within the endoplasm of A. proteus. It's function is to regulate the water content of the cell. It is also a means of excreeting its waste from the cell (out through the cell membrane) VIA diffusion. ... Without the contractile vacuole, the amoeba may burst.

When freshwater amoeba is placed in seawater than seawater being hypertonic the water will flow out of the cell the contractile vacuole will become more contracting to release water and the cell will shrivel up.

that is with more contractions

Answer 2

The contractile vacuole of a freshwater amoeba respond with more contractions if the organism was placed in seawater (option 1).

• Sea water is composed with some amounts of salt.
• The contractile vacuole's job is to maintain the inner solution of the amoeba to be isotonic with the outer environment.
• As sea water has high concentration of salt, and the amoeba body has lower, water gushes in through osmosis.
• The salt concentration inside the amoeba increases rapidly hence the contractile vacuole increases it's pace to remove excess salt. This makes it to contract more.
• The organelle bursts eventually.

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