Question

cell transport
use the following passage and illustration to answer the question.
an osmosis investigation was conducted using chicken eggs to represent cells with semipermeable membranes. the mass of each egg was measured to determine how much water diffused into or out of the eggs. the eggs were first soaked in vinegar to dissolve the shell. each egg was then placed in one of three different solutions for 24 hours. the table below shows the results of the investigation.
osmosis in cells
what is the independent variable in the osmosis experiment?
(1pt)
a the mass of the eggs before soaking
b the percent change in mass of the eggs
c the time the eggs were soaked
d the type of solution the eggs were placed in

Explanation:

In an experiment, the independent variable is the factor that is deliberately changed. Here, the type of solution (vinegar, distilled water, corn syrup) the eggs are placed in is the manipulated variable. The mass of eggs before soaking (A) is a constant for each egg initially, the percent change in mass (B) is the dependent variable (depends on the solution), and the time (C) is kept constant (24 hours as per the text "for 24 hours").

Answer:

D. The type of solution the eggs were placed in