Last Days on Earth 23:45
Energy

Energy is the ability to do work
 Cars running on fuel  Chemical Energy
 Computers and light bulbs  Electrical Energy

Living organisms depend on energy, too.

Sometimes, it is easy to see when we need energy

Other times, it is not that obvious

All organisms obtain
energy in different ways

How do autotrophs/producers obtain energy?

All the energy that living organisms use is traced back to the sun
What is Photosynthesis?
Photo = Light
 Synthesis = Putting Together



Means “using light to put something together”
Chemical process that uses sunlight to convert water and carbon
dioxide into glucose and oxygen
Reactants for Photosynthesis

Plants only need:
 Carbon Dioxide
 Water
 Sunlight (Activation Energy)
Products from Photosynthesis

Plants will produce:
 Glucose (Carbohydrate)
 Oxygen
General Chemical Reaction
+ 6H20
Sunlight
C6H12O6 + 6O2
+ Water
Sunlight
Glucose Oxygen
+
(Sugar)

Occurs in the chloroplast

Chlorophyll
 Molecule/pigment found in chloroplast that gathers the sun’s
energy (sunlight)
Photosynthesis Quick Check

Think again about the volcano video from the first of class and
explain why it would be an “End of the World” scenario.

In your explanation, use and underline the following key terms
related to the process of photosynthesis.
• Key terms
 Sunlight
 Autotroph
 Heterotroph
 Photosynthesis
 Carbon Dioxide
 Oxygen
 Water
 Glucose (Sugar)