Photosynthesis

1
Photosynthesis

• Grade 7 Science
• Mr. Genovese

2
What is photosynthesis?

• Process plants use to make their own food
• Plants leaves contain chlorophyll
• Chlorophyll (green color) makes photosynthesis
  possible
• Autotrophs ? Heterotrophs

3
Food Chain
4
The chlorophyll absorbs the sunlight.
5
The sunlight is combined with water, Carbon
Dioxide and nutrients from the soil.
CO2
6
Photosynthesis

• Stomata on the underside of plant leaves take in
  carbon dioxide
• 6 CO2 6 H2O --? C6H12O6 6 O2
• The sugar is stored by the plant and the Oxygen
  is released through the stomata

7
The chlorophyll processes the ingredients and
makes sugar (plant food) and oxygen.
Sugar Air
O2
8
Plants and animals need each other to survive.
9
Animals including humans make the CO2 (carbon
dioxide) plants need.They (the plants) make the
O2 (oxygen) and food we need.
10
Cell Respiration

• The process in which cells obtain energy from
  glucose
• Cells break down the food they have stored and
  use the energy
• Does not necessarily require oxygen

11
Two Stages

• Stage One the Cytoplasm
• Enzymes break down glucose in the cytoplasm
  without oxygen, little energy released
• Stage Two Mitochondria
• Mitochondria combine ATP with oxygen to release
  great amounts of energy

12
Respiration Equation

• C6H12O6 6 O2 --? 6 CO2 6 H2O Energy
• Where do the cells get this glucose from to
  produce energy?
• What do you notice about this equation?

13
Photosynthesis and Respiration
14
Fermentation

• Have you ever run as fast as you could for as
  long as you could? How did your muscles feel
  after?
• What you felt was the build up of lactic acid, or
  fermentation in your muscles
• Fermentation requires no oxygen to produce energy

15
Two Types of Fermentation

• Alcoholic Fermentation
• Occurs because of yeast a bacteria that feeds
  on sugars and produces carbon dioxide gas
• Lactic Acid Fermentation
• Occurs in your muscles when doing anaerobic
  exercise
• Runners hit The Wall

16
Fermentation