Transcript Photosynthesis

Photosynthesis
Organisms make food using
light energy
many kinds of organisms carry out
photosynthesis
Multicellular plants
bacteria
Blue-green algae
Plants provide food
for animals, and us, too
Photosynthesis
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Needs co2 & h2o
Needs light energy
Makes sugar
Makes o2
leaf
Photosynthesis equation
6CO2 + 6H2O
C6H12O6 + 6O2
Complex carbohydrates,
proteins, fats, amino acids,
enzymes, coenzymes, pigments
Light Energy – The
the part we can see and the plants
use!
PLANT PIGMENTS ABSORB CERTAIN
WAVELENGTHS OF THE VISIBLE
SPECTRUM (SUNLIGHT)
Chlorophyll b
Chlorophyll a
Beta-carotene
phycoerythrin
phycocyanin
Plants are green because they reflect
the green wavelengths and absorb
(and use) the others.
• Your favorite blue shirt is blue because it
reflects blue wavelengths and absorbs the
other wavelengths ….
• Plants reflect green wavelengths.
The leaf is the primary
photosynthetic organ of the plant
Leaves take in CO2 while
roots take in H2O
Chloroplasts are found in the cells of
the leaf and other photosynthetic
parts of the plant
Green plant cells
contain chloroplasts
Photosynthesis occurs as long as light is available
Photosynthesis occurs all day
Photosynthesis and
respiration are
interdependent upon
each other – plants carry
out both processes
goodnight
All organisms need energy
Why do we need energy?
To Grow
To Move
To Reproduce
ETC.
Respiration provides energy from
food
• Aerobic
respiration
requires oxygen
• Anaerobic
respiration does
not require
oxygen
Aerobic Respiration Equation
C6H12O6 + 6O2
Glucose + oxygen
6CO2 + 6H2O + ATP
carbon dioxide + water + ATP
Respiration occurs in the Mitochondria of Cells
Aerobic Respiration has
three major steps
• 1
• 2 
34-36 ATP
• 3 
Respiration provides
Energy from food so we
can:
The end