Transcript Photosynthesis - Issaquah Connect

Good
Morning!
Tuesday, 3/14
Revisiting Photosynthesis
Photosynthesis Review
https://www.youtube.com/watch?v=JJxZH_
Y5D4s
How is Carbon emitted into
the atmosphere?


Respiration
Burning of Fossil Fuels




Coal
Oil
Natural gas
Decomposition

When in the soil, bacteria and fungi break down
detritus (dead plant and animal life) and
carbon dioxide is released into the atmosphere.
How is Carbon absorbed from
the atmosphere?


Photosynthesis
Diffusion into the surface ocean


The surface ocean absorbs more carbon
dioxide than land
Storage in soil and deep ocean from dead
and decaying plant and animal life
Carbon circulates from the surface ocean down
to the deep ocean
 Detritus (dead and decaying marine life)
collects in the deep ocean where carbon can
be stored for hundreds of years.

THE SUN: MAIN SOURCE OF
ENERGY FOR LIFE ON EARTH
AN OVERVIEW OF
PHOTOSYNTHESIS
Photosynthesis is the process by which
autotrophic organisms use light energy to
make sugar and oxygen gas from carbon
dioxide and water.
Carbon
dioxide
Water
Glucose
PHOTOSYNTHESIS
Oxygen
gas
Light Energy Harvested by
Plants
6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2
Food Chain
THE FOOD WEB
WHY ARE PLANTS GREEN?
Plant cells have
green
chloroplasts
The thylakoid
membrane of the
chloroplast is
impregnated with
photosynthetic
pigments (i.e.,
chlorophylls,
carotenoids).
THE COLOR OF LIGHT SEEN IS
THE COLOR NOT ABSORBED
Chloroplasts absorb
light energy and
convert it to chemical
energy
Light
Reflected
light
Absorbed
light
Transmitted
light
Chloroplast
Chloroplasts: Sites of
Photosynthesis
 Photosynthesis


Occurs in chloroplasts, organelles in certain
plants
All green plant parts have chloroplasts and
carry out photosynthesis
 The
leaves have the most chloroplasts
 The green color comes from chlorophyll in the
chloroplasts
 The pigments absorb light energy
The Location and Structure of
Chloroplasts
Chloroplast
LEAF CROSS SECTION
MESOPHYLL CELL
LEAF
Mesophyll
Stomata
CHLOROPLAST
Intermembrane space
Outer
membrane
Granum
Grana
Stroma
Inner
membrane
Stroma
Thylakoid
Thylakoid
compartment
How does Carbon get back to
the Atmosphere?
Animals Eat Plants
 When
organisms eat
plants, they take in the
carbon from the plant.
 Some of it becomes
part of their own
bodies.
 Some of it will be
released to the
atmosphere.
How does Carbon get back to
the Atmosphere?
This process is called
“Respiration!”
Equation:
Food + Oxygen  Carbon Dioxide + Water
C6H12O6 + O2 CO2 + H20
How does Carbon get back to
the Atmosphere?

The Goal of “Respiration” is to
break down glucose and
release energy for cell
processes.
• Since all living organisms need this
energy, all living organisms do
respiration…even plants!!!
Where in the cell does
Respiration take place in the
cell?
This happens in
a structure in
the cell called
the
mitochondria.