Question

1. one grape is placed in tap water and another grape is placed in salt water. the change in their mass is measured after a day.

Explanation:

Identify experimental variables

In this scientific setup, we apply our understanding of Independent Variable and Dependent Variable to analyze the experiment. The factor that the experimenter deliberately changes or manipulates is the type of solution the grape is placed in (tap water vs. salt water). The factor that is measured in response to this change is the mass of the grapes after one day.

Analyze the biological process

This experiment demonstrates osmosis across semipermeable cell membranes. Tap water is hypotonic to the grape's cytoplasm, causing water to enter the grape and increase its mass. Salt water is hypertonic, causing water to leave the grape and decrease its mass.

Determine the independent variable

The independent variable is the type of liquid (tap water vs. salt water).

Determine the dependent variable

The dependent variable is the change in the mass of the grapes.

Answer:

• Independent Variable: The type of liquid (tap water vs. salt water) in which the grape is placed.
• Dependent Variable: The change in the mass of the grapes after one day.