Download 2016 Turgor Pressure

Turgor Pressure
Plants without water…what happens?
What is it?
Turgor Pressure
• Water-filled vacuoles push against cell walls of
a plant. This creates a pushing force called
turgor pressure.
• Why it’s important:
Together, the cell wall and the water-filled
vacuole provide structural support for plants.
Plants stand upright because of
turgor pressure, the force of
water pressing against their cell
walls.
Turgor Pressure
On the left: lots of
water
On the right: not
enough water
(Notice the change in
the vacuole)
http://www.youtube.com/watch?v=fhsurzE_-J0
Balloons….
Draw this:
Carries water and minerals from the
roots through the stem and leaves
The Xylem themselves are a STRUCTURAL adaptation
The carrying of water is a PHYSIOLOGICAL
adaptation: some plants carry the water faster
than others….
Let’s explore how the Xylem works in celery and carnations
Dehydration
• Salt and sugar can act as dehydrators:
taking water out of the cell
• If they are added to a plant cell, what do
you think will happen?
• Let’s see. Cucumbers…….
Now let’s explore using a slice of potato
Write the lab in your ISN….
• Question: How will a salt solution
affect a potato?
Hypothesis:
Choose a hypothesis below and write
it in your journal.
• If a potato slice is placed in salt water
then it will become flexible because the
vacuoles in the cells have dehydrated.
OR
• If a potato slice is placed in salt water
then it will become smaller because the
vacuoles in the cells have dried out.
Copy the chart into your
journal
Experiment:
Water Type
Salt Water
Distilled Water
Mass before
Mass After
Observations
Hypothesis:
• If we put the potato slice in salt water then
________ will happen because __________.
Experiment:
Water Type
Salt Water
Distilled Water
Mass before
Mass After
Observations
While we wait…
https://www.youtube.com/watch?v=fhsurzE_-J0
• http://www.youtube.com/watch?v=fNyYuVarTIQ
• http://www.youtube.com/watch?v=qrp7V0Q5qY
Q
• https://www.youtube.com/watch?v=d26AhcKeEb
E&list=PLE720771409B9EF4A&index=3
While we wait…
Forces in Living Systems
• The teeth apply force in breaking food into
smaller pieces
• Muscles in the esophagus exert a force in
pushing food down the digestive tract through
peristalsis
• Muscles contract and relax, creating a enough
force to move bones to walk, run, jump or
engage in other life processes
• The heart supplies the force that causes blood
to flow through blood vessels.
Analysis:
1. What did you notice about the potato in the salt
water?
2. How did this happen?
3. What happens when a plant wilts?
Conclusion: summary
Tell me if your hypothesis was valid or invalid.
Explain why!
Show your teacher your journal when you are done to receive your stamp