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Food for Plants
Cellular Energy
(Photosynthesis &
Cellular Respiration)
An Introduction
What is Photosynthesis?
The process of
photosynthesis is a
chemical reaction.
The process of converting
light energy to make
chemical energy (glucose)
It is the most important
chemical reaction on our
planet.
Prefix/Suffix: Photosynthesis
“Photo” means light
“synthesis” means to make
Who & where does it take place?

Most plants, most algae,
and cyanobacteria perform
photosynthesis; such organisms
are called photoautotrophs

Photosynthesis occurs in
chloroplasts of the plant cell in
the leaves of a plant.
-Inside the chloroplasts is a
green pigment called
chlorophyll that captures light.
CHOLORPLAST
Chemical reaction of photosynthesis?
Light Energy
Carbon
Dioxide
6CO2
Water
6H2O
Reactant (NEED)
Glucose
C6H12O6
Oxygen
6O2
Products (MAKE)
2. What Happens During Photosynthesis?

Plants capture light energy and
use that energy to make
glucose

Sunlight provides the energy
needed by chlorophyll to change
molecules of carbon dioxide
and water into glucose

Oxygen is also released in this
reaction

Carbon dioxide enters the leaf
through holes called stomata
2. What Happens During Photosynthesis?

CO2 combines with the stored
energy in the chloroplasts
through a chemical reaction
to make glucose

The sugar is moved through
tubes in the leaf to the roots,
stems and fruits of the plants

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 such cellulose
3.Why is This Important to Us?
 We
cannot make our own energy
(glucose), we must get our energy from
plants. It is a carbohydrate used for
quick fuel.
 Organisms,
such as plants and animals,
take glucose and change it into ATP
energy during cellular respiration.
 Plants
are the first step in the food
chain.
 The
oxygen released during
photosynthesis is necessary for all
living things.
Cellular Respiration
1. What is Cellular Respiration?
 Once
the energy that was in sunlight is changed
into chemical energy by photosynthesis, an
organism has to transform the chemical energy
into a form that can be used by the organism.
 This process is cellular respiration.
2. Who & where does it take place?

Takes place in ALL living thingsbacteria, plant, protists, fungi, AND
animal

Cell respiration occurs in “MIGHTY”
MITOCHONDRIA in eukaryotic cells.
3. Describe Cellular Respiration
•Definition: The process of breaking down glucose
molecules to release cellular ATP energy
• Respiration means “to breathe”
-AEROBIC respiration when oxygen is used
-ANAEROBIC respiration when NO oxygen is used (aka
fermentation)
• Is a step by step process:
A. Glycolysis
B. Krebs Cycle/Citric Acid Cycle
C. Electron Transport Cycle
Light vs Dark
2 ATP
32-34 ATP
2 ATP
2 ATP
Review Cellular Respiration
All living things need ENERGY
Energy in the form of…

Glucose = chemical energy
Cell energy=
ATP
Figure 8-3 Comparison of ADP and
ATP to a Battery
Section 8-1
ADP – Low energy
ATP – high energy
Energy
Adenosine diphosphate (ADP) + Phosphate
Partially
charged
battery
Energy
Adenosine triphosphate (ATP)
Fully
charged
battery
4. What is the Equation for Cellular
Respiration?
Glucose
C6H12O6
Oxygen
6O2
Carbon
Dioxide
Water
6CO2
6H2O
Comparing Photosynthesis & Cellular Respiration
The product of one process is the reactant of the
other! *flip flop
• Photosynthesis stores energy into glucose- Cell
Respiration releases energy from glucose
• Photosynthesis removes CO2 and respiration
returns it.
Carbon Cycle
Process of ATP to ADP
In class activity: All classes