Transcript Photosynthesis

Photosynthesis
How organisms obtain their energy
http://www.goalfinder.com/preview/SPLPHE9.swf?productid=39
Photosynthesis
 Photosynthesis:

The process through which plants make
their own food through means of a
chemical change.
 Through the process of photosynthesis,
plants and some other organisms convert the
sun’s radiant energy into chemical energy.
Where does photosynthesis
occur?
Photosynthesis occurs in the
leaves of a plant in organelles
called chloroplast.
Plant Leaf Structure
A. Basic Leaf Structure
1. Stomata (Stoma)
2. Mesophyll Cell
3. Chloroplasts
Stoma
Mesophyll Cell
Chloroplast
Plant Leaf Structure
B. Basic Leaf Structure
1. Stomata (Stoma) are pores in a plant leaf
surface through which water and gases
are exchanged between the plant and
the atmosphere.
Oxygen
(O2)
Carbon Dioxide
(CO2)
Plant Leaf Structure
A. Basic Leaf Structure
2. The mesophyll cell is a cell found on
the surface of a leaf.
Nucleus
Cell Wall
Central Vacuole
Chloroplast
Plant Leaf Structure
A. Basic Leaf Structure
3. Chloroplasts are tiny organelles within
the plant cell where photosynthesis
takes place.
The purpose of
the chloroplast is
to make sugars
and starches
Photosynthetic Process
A.
B.
C.
D.
E.
Plants take in carbon dioxide (CO2)
Plants take in water (H2O)
Plants absorb light (Light)
Sugar (plant food) is created (C6H12O6)
Oxygen is produced and released (O2)
6 CO2 + 6 H2O + Light  C6H12O6 + 6 O2
What do they do with the energy?
 As a result of
photosynthesis, plants
meet their immediate
need for energy—to
grow, develop, respond,
and reproduce.
 The food not used right
away is stored by plants
in their roots, stems,
leaves, fruit, or flowers
What are the raw materials of
photosynthesis?
 The raw materials (reactants) of
photosynthesis are carbon dioxide and
water.
What are the products of
photosynthesis?
 The products of photosynthesis are
sugar and oxygen.
What provides the energy for the
chemical reactions of
photosynthesis?
 The sun provides
the energy for
photosynthesis.
Energy Transformation
 Light Energy is also
called radiant energy.
 Radiant energy is
transformed through a
chemical reaction
inside the plants
leaves.
 It is stored inside the
plant as chemical
energy in the glucose
(“food”).
Autotrophs
 Organisms that are able
to make their own food (in
the form of sugars)
 Use the energy of the Sun
are called autotrophs,
meaning "self-feeders".
 This is another word for
what producers do!
Heterotrophs
 Heterotrophs feed off of
other forms of life.
 The term heterotroph can
refer to single or multi-celled
organisms.
 This is another word for what
consumers do!
The Formula

(sunlight)
Carbon Dioxide + Water  Sugar + Oxygen
(sunlight)
6CO2 + 6H2O  C6H12O6 + 6O2
Assignment
Photosynthesis Word Picture
 You can only write the word “Photosynthesis”
 No other words
 Pictures and symbols only
 Create a PICTURE that shows the meaning
or definition of photosynthesis
 Color it!
 Chapter 2, page 40