Photosynthesis
Energy & Life
Objectives
Explain why almost all organism
depend on photosynthesis
Describe the role of ATP in cellular
activities
Explain where plants get the energy
they need to produce food
Energy for Life
All organism use energy to carry
out the functions of life
Where does this energy
ultimately come from?
Energy for Life
Two Main Types of Organisms
AUTOTROPH
Get energy by
making their
own food
Do so by
building organic
molecules
HETEROTROPH
Get energy by
taking in food
Do this
directly or
indirectly from
autotrophs
AUTOTROPHS & HETEROTROPHS
EXAMPLES
AUTOTROPHS
HETEROTROPHS
Autotrophs & Heterotrophs Review
1. What is an autotroph?
2. What is a heterotroph?
3. How does each one get their energy for life
functions?
4. Give 3 specific examples of each.
HOW IS ENERGY STORED
AND RELEASED?
Energy comes in many forms: heat,
light, electricity and chemical
The activities of cells are powered
by chemical energy compounds
For example:
Living things use ATP
ATP
Adenine
Ribose
3 Phosphate groups
Adenosine Triphosphate
Releasing Energy
Break off a phosphate
RELEASE ENERGY!
Storing Energy
Put the phosphate back on
STORE ENERGY!
Generating ATP
ADP
ATP
Energy
Adenosine diphosphate (ADP) + Phosphate
Partially
charged
battery
Energy
Adenosine triphosphate (ATP)
Fully
charged
battery
What kind of
work do cells
do?
Review Questions
5. What is the role of ATP in cellular
activities?
6. What is the difference between ATP
and ADP?