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• OPEN TO PAGE 50.
Photosynthesis
I. What is Photosynthesis?
A. The process of changing light energy (in
the chloroplasts) to chemical energy
(food for plants)
B. The Sun is the main source of energy
II. Stages
Photosynthesis occurs in two stages:
A. Stage 1: (light dependent stage)
1. the phase that occurs in the light – a pigment in
the chloroplast called chlorophyll captures
sunlight energy
B. Stage 2: (Light independent stage)
1. carbon dioxide and water and used to make
glucose and oxygen
C. Side note:oxygen and carbon dioxide move
through the stomata under the leaf
III. What is the equation for the chemical
reaction of photosynthesis?
A.
Carbon dioxide + water + light energy  Glucose + Oxygen
B.
6CO2 + 6H2O + L.E.  C6H12O6 + 6O2
IV. Photosynthesis Facts
A. Occurs in plants, algae, and some
protists
B. Plants need light energy, CO2, and H2O
C. Oxygen is also released in this reaction
D. Energy stored as sugar called GLUCOSE
E. Takes place in the chloroplasts, using
chlorophyll, the green pigment in plants
V. Importance of Photosynthesis
A. Autotrophs: make their own food
1. Example: plants
2. Side Note: Plants are the first level of the
food chain (producers)
B. Heterotrophs: get their food by eating
other organisms
1. Example: Humans
Importance of Photosynthesis
C. The oxygen released during
photosynthesis is necessary for all living
things.
VI. What happens during
photosynthesis?
A. Carbon dioxide enters the leaf through holes
called stomata
B. CO2 combines with the stored energy in the
chloroplasts through a chemical reaction to
make glucose
C. The sugar is moved through tubes in the leaf to
the roots, stems and fruits of the plants
D. Some of the sugar is used right away by the
plant for energy; some is stored as starch; and
some is built into plant tissue
To be completed:
• Read the photosynthesis paper.
• Answer the two questions on back of
reading.
• Complete the pink half sheet using the
reading.
• Monocot/Dicot Worksheet (purple)
– Circle whether the plant is an example of a monocot
or dicot.
– Give one reason for how you know.
– Use pages 51-53 in your notebook to help you.
Monocot/Dicot Worksheet
• Circle whether the plant is an example of a
monocot or dicot.
• Give one reason for how you know.
• Use pages 51-53 in your notebook to help
you.