Question

a laboratory technician is provided with a urine sample. a small leaf accidentally falls into the urine sample and, within minutes, begins to swell. this reaction suggests that the urine sample is: hypertonic. hypotonic. hyperosmotic. isotonic.

Explanation:

When a leaf swells in a solution, water moves into the leaf cells via osmosis. This happens because the solution (urine) has a lower solute concentration than the leaf cells, meaning the urine is hypotonic relative to the leaf. Hypotonic solutions cause water influx and swelling in cells/organisms with higher internal solute concentrations.

Answer:

hypotonic.