Question

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A scientist was observing a unicellular organism over a period of time. He noticed that vacuoles kept moving to the same place in the plasma membrane to empty their contents outside the cell.

The organism he was observing was
an amoeba
.

Answer 1

That's not correct. The described behavior (vacuoles repeatedly moving to the same spot on the plasma membrane to empty their contents) is characteristic of a ciliate such as Paramecium. Paramecium has contractile vacuoles that collect excess water and empty it through a fixed pore; amoebae have contractile vacuoles but they do not use a fixed pore in the same way.