Download Tropisms and Photosynthesis

Tropisms and Photosynthesis
Warm Up 4-18-16
What are the 4
biomolecules
and where is
each made in
the cell?
What type of
biomolecule is
ATP and where
is it made in
the cell?
Tropisms
• Tropism is the growth of a plant towards or
away from a stimulus (which is something
that causes change like light, gravity or
contact)
• There are positive and negative tropisms:
– Positive Tropisms are towards the stimulus
– Negative Tropisms are away from the stimulus
Phototropism/Gravitropism
3 Main Types of Tropisms
Phototropism
‘Photo-’ means ‘light’
Phototropism is the bending
of a plant towards light
(remember that ‘towards’ is
a positive tropism)
This is caused by a plant
hormone called Auxin
3 Main Types of Tropisms
Gravitropism
AKA Geotropism
‘Gravi-’ refers to ‘Gravity’
Gravitropism is the bending of a
plant towards or away from
gravity
-Roots are a positive
gravitropism and grow towards
gravity
-Shoots are a negative
gravitropism and grow away from
gravity
Thigmotropism
3 Main Types of Tropisms
Thigmotropism
‘Thigmo-’ refers to ‘Touch’
Thigmotropism is the bending
of a plant in response to touch
You see this with vines that
twist around trees or buildings
This is what venus fly traps are
able to do
Venus Fly Traps
Photosynthesis
• Plants utilize tropisms to increase the amount
of sunlight that they can acquire to maximize
photosynthesis
See if you can write the chemical equation for
photosynthesis in your notebook.
Photosynthesis
Now I will give you the components, see if you can
get them on the correct side of the equation:
C6H12O6
Energy
H2O
O2
CO2
?
?
Photosynthesis
Here is the equation with everything on the
correct side. Check your work, but remember
that it doesn’t matter which order you have
them in so long as they are on the correct side.
__CO2 + __H2O + Energy  __C6H12O6 + __O2
Now Balance the Equation
Photosynthesis
Your final equation should look like this:
Now write the equation for Respiration!
Name that Tropism!
What type of tropism is this? Positive or Negative?
Negative
Gravitropism
Name that Tropism!
What type of tropism is this? Positive or Negative?
Positive
Thigmotropism
Name that Tropism!
What type of tropism is this? Positive or Negative?
Positive
Gravitropism
Name that Tropism!
What type of tropism is this? Positive or Negative?
Positive
Phototropism
Name that Tropism!
What type of tropism is this? Positive or Negative?
Positive
Thigmotropism
Name that Tropism!
What type of tropism is this? Positive or Negative?
Negative
Phototropism