Physical Science Aks

Two solutions were placed in a beaker with a semipermeable membrane separating them. Which student’s hypothesis would be the most accurate?

• Student A: The sugar molecules will move from an area of lower concentration to an area of higher concentration due to passive transport by way of osmosis.

• Student B: The water molecules will move from an area of higher concentration to an area of lower concentration due to active transport by way of diffusion.

• Student C: The water molecules will move from an area of higher concentration to an area of lower concentration due to passive transport by way of osmosis.

• Student D: The sugar molecules will move from an area of higher concentration to and area of lower concentration due to active transport by way of diffusion.

After observing the change in the image, what would be an accurate conclusion about the animal cell?

• The animal cell was placed in a hypertonic solution, due to osmosis water exited the cell causing it to swell and burst.

• The animal cell was placed in a hypotonic solution, and due to osmosis, water entered the cell causing the animal cell to swell and burst

• The animal cell was placed in a hypotonic solution and due to simple diffusion, the water entered the cell making the cell swell and burst

• The animal cell was placed in a hypertonic solution and due to the active transport, the cell lost water making it swell and burst.

After observing the change in the plant cell, what would be an accurate conclusion about the plant cell.

• The plant cell was placed in a hypertonic solution and osmosis caused the water to exit the cell and shrivel up

• The plant cell was placed in a hypotonic solution and active transport caused the water to enter the cell and shrivel up

• The plant cell was placed in a hypertonic solution and simple diffusion caused the water to exit the cell and shrivel up.

• The plant cell was placed in a hypotonic solution and osmosis caused the water to exit the cell and shrivel up

Tags

NGSS.MS-LS1-2

A class of students was asked to demonstrate their understanding of how different cells respond to their environments. The students are asked to propose a research question and hypothesis about the results of an investigation to answer their question.

• Student X

• Student Y

• Student W

• Student Z

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-5

NGSS.MS-LS2-4

The students measured the mass of the contents within the selectively permeable bag before placing it into the beaker and then again 24 hours later. Which of the following correctly justifies the results expected from this experimental design? (AKS 2a)

• The mass of the bag would increase over a period of 24 hours, indicating that passive transport is moving water from a higher concentration to a lower concentration.

• The mass of the bag would decrease over a period of 24 hours, indicating that passive transport is moving water from a higher concentration to a lower concentration.

• The mass of the bag would increase over a period of 24 hours, indicating that active transport is moving solute molecules from a higher concentration to a lower concentration.

• The mass of the bag would decrease over a period of 24 hours, indicating that active transport is moving solute molecules from a lower concentration to a higher concentration.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Three students are investigating how celery changes when placed in different types of solutions. The students use similar amounts of celery and solutions at the same temperature. A summary of their results are shown below.

• Solution 1 is isotonic, solution 2 is hypotonic, and solution 3 is hypertonic.

• Solution 1 is hypertonic, solution 2 is hypotonic, and solution 3 is isotonic

• Solution 1 is isotonic, solution 2 is hypertonic, and solution 3 is hypotonic.

• Solution 1 is hypotonic, solution 2 is isotonic, and solution 3 is hypertonic

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Based on these results, which statement correctly predicts what will happen to red blood cells when they are placed in a beaker containing a starch solution that has a starch concentration much higher than that of the red blood cells?

• The red blood cells will absorb water and increase in size

• The red blood cells will first absorb water, then lose water

• The red blood cells will lose water and decrease in size

• The red blood cells will first lose water, then absorb water

Tags

NGSS.MS-LS2-1

The internal NaCl concentration of red blood cells is 0.9 M. The diagram below shows red blood cells submerged in solutions of four different NaCl concentrations‐ 0M, 0.65 M, 0.9 M, and 2 M.

• 4

• 1

• 3

• 2

Tags

NGSS.MS-PS1-2

The diagram shows a beaker of water and molecules of black dye at the beginning of an experiment (Time 1) and the same beaker of water and molecules of black dye after 30 minutes (Time 2).

• Molecules of black dye moved by diffusion from a lower solute concentration to a higher solute concentration.

• Molecules of water moved by osmosis from a lower solute concentration to a higher solute concentration.

• Molecules of black dye moved by diffusion from a higher solute concentration to a lower solute concentration.

• Molecules of water moved by osmosis from a higher solute concentration to a lower solute concentration.

What is the BEST question for students to ask to further their investigation?

• Did the animal cell burst because it was placed in a hypertonic solution?

• Did the cell wall prevent the plant cell from bursting in a hypertonic solution?

• Did the animal cell burst because it was placed in an isotonic solution?

• Did the cell wall prevent the plant cell from bursting in a hypotonic solution?