1. Autotrophic Nutrition

2. Nutrition
Nutrition: an organism’s ability to obtain and process materials needed for energy, growth, repair and regulation.
Two type of nutrition:
heterotrophic
autotrophic

3. Autotrophic Nutrition
Autotrophs produce their own food (sugar) from inorganic compounds.
Autotrophs produce sugar through the process of PHOTOSYNTHESIS

4. What is Photosynthesis?
Photosynthesis: plants use energy from the sunlight to convert carbon dioxide (CO2) and water into oxygen (O2) and sugar.
The equation for photosynthesis:
6 CO2 + 6 H2O C6H12O6 + 6 O2

5. Where does photosynthesis occur?
In the chloroplasts!
Remember
the elodea?

6. Structure of the Chloroplast

7. Structure of Chloroplast
The chloroplast is surrounded by a double membrane.
Thylakoid = membrane that contains CHLOROPHYLL
Grana = stack of thylakoids
Stroma = fluid portion of the chloroplast

8. Chlorophyll
Chlorophyll is the major pigment that traps energy from sunlight
There are other pigments that help out chlorophyll

9. Photosynthesis Overview

10. Light-Dependent Reactions
Photolysis – energy from the sun is used to split H2O
O2 is released
ATP and NADPH (electron carrier) are made

11. Calvin Cycle
Uses the ATP and NADPH made in the light-dependent reaction
CO2 is used to make SUGAR

12. The Leaf
The CO2 required by the plant enters through stoma (tiny openings under the leaf)

13. Guard Cells: open and close the stoma on a leaf

14. Plants convert light energy into chemical energy through the process of PHOTOSYNTHESIS.
This is AUTOTROPHIC NUTRITION

15. Guard
Cell
Stoma