Photosynthesis
ATP/ADP
Photosynthesis Process
Calvin Cycle, NADPH, and Chloroplasts
Energy- ability to do work
 1.
What types of activities require energy?
 2.
How do humans obtain most of their energy?
 3.
How do plants obtain most of their energy?
Autotrophs vs. Heterotrophs
 Auto
(self) trophs- organisms that can
make their own food (producers)
 Heterotrophs- organism that rely on
eating other materials to obtain
energy (consumers)
ATP/ADP

Powers cellular work

Renewable energy source

Adenosine tri phosphate

Made up of 3 parts (Adenosine- nitrogenous base, Ribosesugar, Phosphate groups -3 (tri) 2 (di)

Energy is stored and released through the phosphate
groups adding or losing a Phosphate.
Photosynthesis
Process
that plants use to
obtain energy converting
sunlight, water and CO2 into
O2 and high energy
carbohydrates
(sugars/starches.)
Van Helmont
 Calculated
mass of planter, soil and
seedling.
 Watered plant…and it increased in
mass.
 Water was the only material Van
Helmont added…water was food for
the plant!
Joseph Priestly
 Put
a candle in a bell jar
and the lit it. Candle went
out (no oxygen)
 Put
a plant in the bell jar
and the candle was able to
be re-lit…
 Plants
give off oxygen!
Jan Ingenhousz
 Showed
that
Priestly’s
experiment only
worked in the
presence of light.
 Light
is necessary
for plants to
produce Oxygen.

Plants capture light from the sun and absorb the
energy from that light into electrons in the
chlorophyll molecule.

Chlorophyll is the pigment in chloroplasts
(organelle that is responsible for photosynthesis in
plant cells.)

Chlorophyll absorbs colors except green, which is
reflected.
Chloroplast

-Organelle
where photosynthesis takes place

Chlorophyll is the pigment found in chloroplasts
that help trap sunlight and store/use the energy.

2 steps

A) Light-dependent reaction

B) Light-independent reaction (Calvin Cycle)
Parts of the chloroplast
Double membrane- A1/A2 (selectively
permeable) allow materials in and out
of the cell
 Stroma- B (like cytoplasm) Calvin cycle
(light-independent reaction happens
here)
 Thylakoids- C stacks of grana that
contain chlorophyll that capture the
sun’s light.

NADPH
 Sunlight
give energy to electrons in
chlorophyll
 Special electron designed to carry high
energy electrons and carry them to other
molecules.
 NADP is the electron carrier…add H and it
becomes NADPH. This chemically traps
energy.
Light-Dependent Reactions
 Requires
light (duh)
 ADP--ATP
 NADP--NADPH
 Uses light from the sun!
 Produces O2
Light-Independent reaction (AKACALVIN) cycle

Part 2 of Photosynthesis

Uses ATP, NADPH and converts in into long term energy storage
(SUGARS)

Does not require light

Takes in CO2 from atmosphere-- releases sugar (energy)

Sugar aids in growth and development and production of complex
carbohydrates.
http://www.youtube.com/watch?v=ixpNw6mx3lk
Photosynthesis foldable
 Obj:
Create a foldable that describes the
process of photosynthesis breaking down
the 2 main parts of photosynthesis, the
equation for photosynthesis and details the
chloroplast and the role it plays in
photosynthesis.