Lab 5 PG62 Cell Transport Potato Lab Notes

Lab #5: PG#62 Cell Transport Potato Lab & Notes Foldable Thursday Week 11

Thursday Week 11 Unit/Topic: Cells: Cell Membrane Essential Question: How does the cell membrane help maintain homeostasis? Reminders: Show your parents the biome letter & collect 2 -Liter bottles Homework: Notebook Check Today periods 1 & 3! Tomorrow Periods 4 -6!

Lab #5: Changing Potatoes 1. Turn to page 62 and divide your page like this→ Lab #5: Changing Potatoes 62 EQ: 11/2/1 Plain Water Cup Salt Water Cup 6 Before: After: 2. When done, send one person from your group to get 2 potato slices from me. 3. Take your two potatoes and write a “S” for salt on one gently in pencil. 4. Then go weigh each potato separately (in grams)- make sure to zero the scale before each use and keep the slices Model:

Pg. 62: Changing Potatoes In your notebook, divide the page into three sections of about 10 lines and draw this in the top third. 5. For each potato. Lab #5: Changing Potatoes EQ: How does the cell membrane help maintain homeostasis? 62 salt and plain, write Plain Water Cup Salt Water Cup 11/2/16 Before: Potato weight before: ____g observations (descriptions) Observations: about each of the potato slices in each cup BEFORE the lab. Time lab started: _______ -Color, texture, length, thickness, flexibility. . . After: Time lab ended: _______

6. Once you have weighed each potato and taken 3+ observations about each one, put your potatoes in their respective beakers of water- one in salt and one in plain. Write down the time you put them in. Then make a new Cell Transport foldable while we wait. . .

Food Dye Demo in 2 beakers: What happened? https: //www. youtube. com/watch? v=i. HHCGidm. E 1 k The dye diffuses out into the water, “spreads out”

Make a Cell Transport Foldable (instead of Notes)

Back to the lab. Record the time you remove the potatoes, dry them off, and weigh them again.

Pg#62 Middle third: 7. Write down the time at which you take them out of the water. 8. Take out the potatoes and write down your new observations. 9. Weigh each potato again- making sure to dry them off before doing so. (steps 8 & 9 can be done in any order depending on scale busy-ness)

Name P. Date Exit Ticket: 1. What change did you see in the plain water potato weight? Make a prediction about what happened. 2. What change did you see in the salt water potato weight? Make a prediction about what happened.

Lab Clean-up: 1. Throw both potatoes away in trash can 2. Dump both beakers down drain 3. Refill tap water in the plain cup up to around 50 m. L full 4. Bring “S” salt water cup to me to fill

Day 2 - first half of class Work on Foldables

Diffusion

Pg. 3

Osmosis

Pg. 4

w/ WS

Biome Building Day 1

Day 3 Finish Foldables & Lab Analysis

Pg. 5

Osmosis & Semipermeable membranes https: //ww w. youtube. com/watc h? v=w 3_8 F Srqc-I

Pg. 62 Bottom Third: What happened to the potatoes? Plain Water Observations: The salt water potato looked… It felt… This solution is: _______ Salt Water Observations: The tap water potato looked… It felt… This solution is: _______ 10. Sketch the two beakers and the potatoes within. 11. You will draw a model of what you think happened to the potato slices in each solution by adding arrows for the movement of water in or out of each potato. *Remember, water always moves BOTH ways through a membrane but can move in one direction MORE than the other. *

Key Changing Potatoes: Part 2 How did water move in the cells? Salt Water Tap Water Potato should feel larger due to water gain Higher solute concentration in potato Water goes IN to dilute starch Potato should feel flimsy due to water loss Higher solute concentration in water H 2 O Water goes OUT to dilute salt H 2 O Salt Water: 75% Water, 25% Salt Potato Cells: 80% Water, 20% solutes Tap Water: 99% Water Potato Cells: 80% Water, 20% solutes

Solutions used for Potato lab

Key Analysis- How did water move in the cells? Salt Water Plain Water Potato should feel larger due to water gain Is this Solution HYPERTONIC, ISOTONIC, OR HYPOTONIC? Water goes IN to dilute starch Potato should feel flimsy due to water loss Is this Solution HYPERTONIC, ISOTONIC, OR HYPOTONIC? H 2 O Water goes OUT to dilute salt H 2 O Tap Water: 99% Water, 1% Salt. Potato Cells: 80% Water, 20% solutes. Salt Water: 75% Water, 25% Salt. Potato Cells: 80% Water, 20% solutes.

Active Transport

Skip pg. 6 Pg. 7

Biome Sealing- Day 2 Google Classroom PPT

w/ WS

Honors only https: //www. youtube. com/watch? v=d. PKv. Hr. D 1 e. S 4

https: //www. youtube. com/watch? v=qot. IWg. L 7 z. Fs &index=13&list=PLLEHKEFhn. Fk 6 GSSr. JXpx. DJIP 5 Q ZZgl. Qp. R REVIEW All 3

Mocete extra slides

Page 6: Diffusion: Movement of molecules from high to low concentration. No energy is required from the cell! High Low

Foldable: Page 7 Diffusion Human Body Examples to Maintain Homeostasis: 1. Lungs: O 2 + CO 2 diffuse through membranes of the lungs (blood moves O 2 + CO 2 to and from the cells). 2. Intestines: Nutrients and fluids diffuse across the intestinal membranes into the bloodstream (to the cells). 3. Kidneys: Remove extra salt from the blood.

Page 4: Osmosis: Water molecules moving from a high to low concentration across a semipermeable membrane.

Page 5: Osmosis Hypertonic: There are more dissolved solutes outside the cell than inside, meaning less % water outside than inside. Cell get skinny. Isotonic: The number of dissolved solutes on the inside is equal to the number on the outside. Cell stays the same size. Hypotonic: There are more dissolved solutes inside the cell than outside. Water moves inside the cell and the cell gets fat. .