Transcript Photosynthesis - Highline Public Schools

The ability to create energy from the
sun and Carbon Dioxide
• Plants and other types of organisms are able
to use light energy from the sun to produce
food.
– These species are called AUTOTROPHS- self
feeders
• Other organisms that cannot create their own
food must eat plants
– These species are called Hetertrophs
• Please note that our body needs ATP to carry
our bodily processes, but that it is short term
energy.
• Glucose is used to regenerate ATP to allow the
body to keep functioning.
• Glucose is the organic compound animals
obtain from plants to create energy.
CO2 + H2O + Energy  C6H12O6 + O2
Balance the equation: What does this look like?!
Make sure to note…
• Plants need:
– Carbon Dioxide
– Water
– “Sun light”
– and a pigment called chlorophyll in the
CHLOROPLAST to carry out photosynthesis.
• Pigment is a light absorbing molecule.
• Chlorophyll is the plant “pigment”
Lets review..
• Respiration happens in the animals cell
Mitochondria- this is the energy maker
• In a plant- the energy is created in an
organelle called Chloroplast. This is the energy
creator of the plant.
• When sunlight excites the electrons in the
Chlorophyll, it gains a great deal of energy-
• Uses energy to create ATP
• Steps:
1. Light is absorbed by Chlorophyll in the thylakoid
stacks
2. Hydrogen is released during the breakdown of
water and is used to create ATP
3. The oxygen is released into the environment as a
byproduct
• This is called light independent reaction.
• Although it is still in the chloroplast, by the
time the light energy gets to the
,
it no longer needs the light.
1. CO2 molecules are absorbed from the
atmosphere
2. The carbon is taken out of the CO2 to react
with water to form glucose
3. The O2 left over is released back into the
atmosphere
So…
• Light dependent reaction:
–Takes in H20 and releases O2
• Calvin cycle:
–Takes in CO2
• Creates sugar
• Releases O2