photosynthesis
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Transcript photosynthesis
Chapter 6
Photosynthesis
Section 6-1
Capturing the
Energy in Light
Photosynthesis
Process by which part of the
energy in sunlight is transferred
to, and stored within, organic
compounds
Energy for Life Processes
Organisms that make their own
food are called autotrophs, or
producers
Mainly plants
Heterotrophs get their energy by
eating other organisms
All life depends on autotrophs
Reaction
Reaction
CO2+H2O+Energy from sunlight C6H12O6+O2
Cellular respiration is opposite
Photosynthesis and cellular
respiration exist as a cycle
Products of one reaction
become reactants of the next
Reaction
Chloroplasts
Chloroplast structure
Inner and outer membrane
Inside, flattened sacs called
thylakoids stack forming grana
Surrounding the grana is an
aqueous solution called stroma
Fig. 6-2, p. 112
Chloroplast
Properties of Light
White light is actually an array of
colors from red to violet (called
the visible spectrum)
Different colors within white light
have different wavelengths
Properties of Light
Properties of Light
When light strikes an object it can
be absorbed or reflected
Pigments are substances that
absorb certain colors of light
Light reflected does not contain
that color
Plant Pigments
Plants contain pigments that
absorb many wavelengths of
light, but not green
That’s why plants look green!
Tomorrow’s Lab…
We will be trying to determine
how many pigments exist in
green leaves
Is there only one pigment, or
are there several pigments? If
so, how many??
Coming Up In Lecture…
We will be discussing the
reactions of photosynthesis…
Light reactions (requiring light)
Dark reactions (DO NOT require
light but may occur in the
presence of light)