Transcript Turgor Pressure Mini Lab.ppt

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Turgor
Pressure
Mini-Lab
There are a few video links in this PPT. For
you to access the videos, you need to…
– Click on the Slide Show tab
– Select “From Current Slide”
Introduction
Read
Only
Plants have water in their cell vacuoles. The water
pushes (like a force) on the cell membrane and cell
wall creating a type of pressure which makes the
cell kind of stiff or rigid.
This type of pressure is called turgor pressure,
enabling the plant (or stem) to stand upright. Lack
of water will cause a drop in turgor pressure,
causing the plant to wilt and die if water is not
replaced.
Vacuole
Pre-Lab Analysis Questions:
Restate the question in your answer for each pre-lab question.
1. Watch video then write the definition of
turgor pressure in your own words.
Click HERE for video to play
2. Watch how adding water changes this
wilted plant. What happens within the cells
when a plant wilts?
Click HERE to play video
3. Presence of water is the internal
stimulus that causes what response?
4. What does the amount of bend tell you about
the turgor pressure inside the celery stalk?
VS.
5. How do you think a piece of wilted celery will
change when it is soaked in water? Write a
hypothesis using the If-Then format.
a wilted celery stalk is soaked in water
If___________________________________,
the celery stalk would become rigid/stiff.
then __________________________________
Example
Your answer does not have to match this one.
Before
After
Click HERE to play video
Observations
• Go to the lab station to feel the celery in the
two beakers.
– Make observations for about 10-20 seconds.
• Do not take your notebook or pencil to the lab
station.
• When you finish observing, return to your
desk.
Observations:
Sketch this T-chart in your journal.
Celery with low turgor
pressure
Celery with high turgor
pressure
Put ALL of the following words on the correct side of the T-Chart:
highly bendable, rigid, stiff, flaccid, flexible, poorly bendable
FYI:
This teacher is discussing the effect of turgor pressure on potatoes in salt water
vs. in distilled water. Our mini-lab was similar in studying turgor pressure but we
used celery in water vs. celery with no water.
Click HERE to play video
READ ONLY
Conclusion:
Write your conclusion in paragraph form (4-5 sentences.)
Include the following in your conclusion:
– State the purpose or objective of the lab
In the turgor pressure lab, a celery stalk was used to
demonstrate how…
– Rephrase your hypothesis
– Briefly summarize your T-Chart observations. What
differences did you observe?
– In the before and after pictures on Slide 10, did the
water move into or out of the celery’s cells?
(Hint: internal adaptation- X _ _ _ _ )