Transcript Feb. 7, 2012 Warm Up

Feb. 7, 2012
Warm Up
1. Take out Journal
2. Weekly Vocabulary sheet (on
table by door)
3. Study notes from yesterday
Daily
Quiz
• 1. The __________ causes
Grades:
-1=90
a reaction to occur.
-2=80
• 2. The stimulus causes a
-3=70
-4=60
__________.
-5=50
• 3. An ___________ stimulus comes
from outside the body.
• 4. An _____________ stimulus comes
from inside the body.
• 5. An _________ behavior is a
response that is taught.
Chapter 25
Plant Responses
and Adaptations.
Set Up Foldable
• Fold Long and Skinny (hotdog)
• Fold short and fat 2 times (hamburger)
• Open so looks like below, crease is on top
What is a tropism?
Tropism ~ a response of a plant
to an environmental stimulus.
Tropism
• Tropism is growth in response to an
external stimulus (factor that elicits a
response).
• Positive tropism: Plant growth toward a
stimulus (water, sunlight)
• Negative tropism: Plant growth away
from a stimulus (spilled gas, toxins, too
much sun or not enough)
What is phototropism?
Phototropism ~ a tendency of
plants to grow toward a source
of light.
Phototropism
• Phototropism is a
change in the growth of
a plant in response to
light.
• The stalk displays
positive phototropism
growing towards the
light.
What is gravitropism?
Gravitropism ~ a tendency of a
plant to grow in a direction in
response to the force of gravity.
What is thigmotropism?
Thigmotropism ~ the response
of plants to touch.
Geotropism (Gravitropism)
• Geotropism is a change in
the growth of a plant in
response to gravity.
• The stalk displays a
negative geotropism
growing away from gravity.
• The roots display a positive
geotropism growing
towards gravity.
Hydrotropism
• Hydrotropism is a
change in the growth of
a plant in response to
water.
• The roots display a
positive hydrotropism
growing towards water.
Turgor Pressure
• http://www.kscience.co.uk/animations/turgor.htm
• Click on link above for example
The cell’s
vacuole
does not
have any
water in it.
The cell is
flaccid.
The vacuole
does not
have a lot of
water in it.
The vacuole and
cell wall push
against each
other.
The vacuole is
now full of water.
Phototropism Box
• Explain how black paper covers up
hole (hole where light enters)
• Ask students to draw plant as is in
journal
• Put plant in box and uncover one of
the holes
• Ask students to predict what will
happen to the plant over the next 24
hours in their journals.