Standards: G. Plant and Soil Science Pathway

G.2.0 G2.2

For the Teacher• Students will learn the basics of osmosis and diffusion and understanding how it

affects plants under different conditions• Students will be able to explain and discuss the different solutions a plant could

be exposed to and the result of such solutionPrior to starting an experiment on osmosis using gummy bears ask a few critical thinking questions/ check for understanding. Have them write in a blank piece of paper and turn it in to you to see if they truly understand what's been discussed.

Going with the

Flow: Osmosis

By Andrea

Melano

What we will accomplish today…

• Understand the process of osmosis and diffusion

• Be able to explain the effect of osmosis in plants with different solutions• Hypotonic• Hypertonic• Isotonic

OsmosisProcess in which a solute passes through a semipermeable membrane.

Low

High

H20

Other Molecule

A solute is a part of a solution which dissolves.

A semipermeable membrane is like a wall on the cell that blocks some molecules and allows others in

The solute travels from an area of high concentration to an area with low concentration.

This process of moving from high to low concentration is

called diffusion

Hypotonic State: a state in which there are less solute molecules outside the cell. This causes water

to move into the cell and that object will expand

Isotonic state: asolution with an equal

concentration to another solution.

How does this apply to Plants?Plants use osmosis to absorb water and nutrients from the soil.

What will happen to a plant in Hypertonic Solution?

Discuss with a partner.

In a hypertonic solution a plant will shrivel up.

• Water inside the cells is drawn out

• Vacuoles and Cytoplasm shrink in size

This causes a lack of structure

What will happen to a plant in Hypotonic Solution?

Discuss with a partner.

In a hypotonic solution a plants cells will fill up to maximum

capacity.

• A strong cell wall stops the cells from bursting

• The plant will become turgid

What will happen to a plant in an isotonic solution?

Discuss with a partner?

In an Isotonic solution the plant will remain in equilibrium.

• Nothing will happen

• No movement of water into or out of the cell

Checking for Understanding: Via the Gummy Bear Family

Momma Bear is in a solution of water

Papa Bear is in a solution of Salt Water

Baby Bear is in a solution of distilled water

Next week we will do an experiment on osmosis using gummy bears Lets take some time to discuss what we believe would happen to these gummy

bears?

Gummy bears have a very low concentration of H2O

Momma Gummy Bear has been placed in a cup of water

What will happen to momma gummy bear and why?

Once again gummy bears have a very low concentration of H2O

Papa Gummy Bear has been placed in a cup of salt water.

Hint: Salt molecules are much smaller then the molecules in the gelatin.

Where are the highest concentrations of solute?

What will happen to papa gummy bear and why?

By now you should know that gummy bears have a very low concentration of H2O

Baby Gummy Bear has been placed in a cup of distilled water

Distilled water is pure water with no impurities.

What will happen to baby gummy bear and why?

Works Cited

Hitchen, Becky. Hypertonic, hypotonic and isotonic effects on plants

and animal cells. 2012. Wiki Spaces.

<http://internalandexternalenvironments2012.wikispaces.com>

Kishe. Youtube- Diffusion and Osmosis. September 29, 2012. Mr. Kish's

Science Channel. October 5, 2014. <https://www.youtube.com/watch?

v=OXCKjhE1xco>

What Is a Semipermeable Membrane? Wise Geek. October 5, 2014.

<http://www.wisegeek.org>

What Is Osmosis? Wise Geek. October 5, 2014.

<http://www.wisegeek.org>