(What to Know)
IB 100/101 Home
Text Readings in Biology, Hoefnagels
Chapter 4, The Energy of Life
Chapter 5, Photosynthesis
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The content of today's lecture will help you complete this
After studying this material you should be able to:
Explain how the process of photosynthesis is involved in
production and an increase in plant biomass.
Draw a sketch of a chloroplast, identify the structural
and indicate where the photosynthetic energy transformations of the
light reactions and the Calvin cycle take place.
List the inputs (raw materials) and outputs (products) of
dependent reactions and the Calvin Cycle.
Describe how the light-dependent reactions and Calvin
chemically and energetically linked.
Describe the role of enzymes in the process of
Explain how the following factors affect photosynthesis:
opening, temperature, light intensity, water availability, and CO2
Explain what the plant does with the carbohydrate that is
will put Illinois at forefront of farm bioenergy production
A collection of animations for Photosythesis from the Smith College Biology 231 Web Page
The whole story of the Photosynthesis light dependent
reactions (Virtual Cell Animation)
Get into groups with one or two other students. Each
turn in her/his own paper.
From your understanding of biomes and the basic equation
photosynthesis, write down the factors you predict to be limiting
rate of photosynthesis and Net Primary Productivity (NPP) for trees
Biomes of North America
Taiga (boreal forests - bright blue area on the map)
Deserts (tan area on the map)
Tropical forests (dark green area in Mexico and
of Global NPP
PRINT YOUR NAME and SIGN your name on the top of your paper.
Pass your paper to the aisle when asked to do so.
Photosynthesis, the big picture
What is sunlight? (Text, Pg. 104, fig. 5.3)
Why are plants green? (Text, Pg. 106, fig.
Plant Cell - Text, page 61, fig. 3.14
Where does photosynthesis happen? (Text, Pg. 105,
Chlorophyll (Text, Pg. 107, fig. 5.8)
Chlorophyll, accessory pigments, and reaction
centers (Photosystems II and I) (Text, Pg. 112, fig. 7.8)
Light Absorbance by pigments (Text, Pg. 108, fig.
5.9 - modified)
Photosynthesis: Summary (Text, Pg. 106, fig.
The conversion of light energy from the sun into
usable chemical energy (ATP & NADPH) in the thylakoid
the chloroplasts of plants
The Calvin Cycle
The production of carbohydrate (sugar) from CO2, using the
energy of ATP and
NADPH produced by the light dependent reactions of Photosynthesis
Photosynthesis: light reactions and Calvin Cycle
(Text fig. 5.9, page 108)
Calvin Cycle (Text, Pg. 110, fig. 5.11)
Cyclic series of enzyme reactions
Addition of CO2 to a 5 carbon compound (RuBP)
Rubisco (the enzyme that fixes CO2)
Enzyme action (Text, Pg. 87, fig. 4.10)
Animation of the Calvin Cycle from Smith College
Summary of energy transformation enzyme reactions in the
Addition (fixing) of gaseous CO2 to RUBP, a 5 carbon
compound in the
stroma of chloroplasts.
Energy input from ATP
(ATP from the light reactions ---> ADP +
Phosphate back to the light reactions)
Addition of H+ and energy from NADPH
(NADPH from the light
reactions ---> NADP back to the light reactions
Production of carbohydrates for storage, transport, and
Recycling of 5 carbon compound (RUBP) to fix more CO2
- Photosynthesis: Summary (Text, Pg. 106, fig.
Plant anatomy: structural and functional integration of
This is what it all distills down to - (Hoefnagels, Pg. 106,