Final answer:
The Elodea cell would experience a decreased turgor pressure after saltwater is added, causing it to become flaccid and lose its rigidity.
Step-by-step explanation:
The Elodea cell would experience a decreased turgor pressure after saltwater is added. The turgor pressure in a plant cell is maintained by the movement of water into the cell, causing it to become stiff and rigid. However, when saltwater, which is hypertonic, is added, water will leave the cell, resulting in a decrease in turgor pressure. The cell may become flaccid and lose its rigidity.